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[[Category:Alfred Russel Wallace]]
[[Category:Human evolution]]
[[Category:Evolution]]
[[Category:Natural selection]]
[[Category:Anthropology]]
[[Category:History of science]]
[[Category:Charles Darwin]]
[[Category:Human variation]]
[[Category:History of evolutionary thought]]

**NOTOC**

== Alfred Russel Wallace on Human Evolution ==

Alfred Russel Wallace was one of the founders of the theory of evolution by natural selection and an important nineteenth-century contributor to the scientific study of human origins and variation. Although Wallace and Charles Darwin independently developed the principle of natural selection, their interpretations of human evolution eventually diverged in significant ways. Wallace initially applied natural selection directly to human populations but later argued that some aspects of human intellectual, moral, mathematical, artistic, and spiritual capacity could not be explained by natural selection alone.

Wallace's writings on humanity covered an unusually broad range of subjects, including physical anthropology, human migration, racial classification, prehistoric archaeology, the antiquity of humanity, animal intelligence, instinct, sexual selection, morality, heredity, population, social reform, colonialism, Indigenous peoples, eugenics, spiritualism, and the nature of consciousness. His changing ideas illustrate both the development of evolutionary science and the assumptions and controversies of Victorian anthropology.

=== Natural Selection and Human Origins ===

Wallace began applying evolutionary reasoning to human populations soon after developing the theory of natural selection. His 1864 paper, "The Origin of Human Races and the Antiquity of Man Deduced from the Theory of 'Natural Selection'," was one of the earliest attempts to explain human physical differentiation through evolutionary processes.

Wallace argued that natural selection had played an important role in shaping early humans. Before the development of sophisticated tools, clothing, shelter, social cooperation, and other cultural adaptations, human populations would have experienced many of the same selective pressures affecting other organisms. Differences in climate, geography, food supply, disease, migration, and other environmental factors could therefore contribute to physical variation among geographically separated populations.

Wallace nevertheless believed that human cultural development changed the operation of natural selection. Once humans increasingly altered their environments through technology, cooperation, clothing, fire, housing, and accumulated knowledge, biological adaptation became less important for responding to environmental challenges. Culture itself became an increasingly powerful means of adaptation.

His work therefore anticipated an important distinction between biological evolution and cultural evolution. Human beings remained biological organisms shaped by evolutionary history, but their ability to modify environments and transmit knowledge altered the relationship between natural selection and survival.

=== Human Variation and Nineteenth-Century Anthropology ===

Wallace's years of exploration in the Malay Archipelago gave him extensive experience observing human populations as well as plants and animals. His writings discussed the peoples of the Malay Archipelago, New Guinea, Australia, Polynesia, and other regions and considered physical appearance, migration, geography, language, technology, social organization, and cultural practices.

Like other Victorian scholars, Wallace frequently used racial terminology that is now historically dated and scientifically problematic. His writings therefore need to be interpreted within the intellectual environment of nineteenth-century anthropology.

At the same time, Wallace often attempted to explain human differences historically and environmentally rather than treating populations as independently created or permanently fixed types. Migration, isolation, intermixture, environmental conditions, and common ancestry all figured in his explanations of human diversity.

Wallace participated actively in emerging anthropological debates concerning prehistoric humans, skull measurements, archaeological discoveries, Indigenous societies, migration, population classification, religion, and the antiquity of humanity. His comments on Neanderthals, prehistoric tools, ancient human occupation, and Pacific migrations show how closely his evolutionary research was connected with the growing sciences of anthropology and archaeology.

=== The Human Mind and the Limits of Natural Selection ===

One of Wallace's most distinctive positions concerned the evolution of the human mind. By 1870 he had concluded that natural selection could explain much of human physical evolution but could not, in his view, completely explain certain higher intellectual and moral capacities.

In "The Limits of Natural Selection as Applied to Man," Wallace argued that some human abilities appeared to exceed what would have been necessary for survival among early human populations. He pointed to advanced mathematics, abstract reasoning, artistic creativity, musical ability, moral awareness, and other capacities as examples.

Wallace reasoned that natural selection normally preserves characteristics because they provide reproductive or survival advantages. If certain sophisticated human abilities greatly exceeded the needs of ancestral populations, he questioned how ordinary selection could have produced them in their fully developed form.

This became one of the major differences between Wallace and Darwin. Darwin sought to explain human mental and moral faculties largely through gradual evolutionary processes, including natural selection, sexual selection, social instincts, habit, and cultural development. Wallace increasingly believed that another principle or influence was necessary to explain the highest human capacities.

=== Darwin, Wallace, and Sexual Selection ===

Wallace remained a strong defender of natural selection throughout his life, but he did not agree with Darwin on every evolutionary mechanism. Their disagreements over sexual selection became particularly important.

Darwin argued that competition for mates and preferences exercised during mate choice could produce elaborate colors, ornaments, displays, and other traits. He extended sexual-selection theory to human evolution and attempted to use it to explain some physical and behavioral differences among human populations.

Wallace was far more skeptical about the power of aesthetic mate preference. He frequently preferred explanations based on natural selection, protection, physiology, behavior, or environmental influences.

His studies of bird coloration, butterflies, nesting behavior, and differences between males and females contributed to this disagreement. Wallace accepted that competition associated with reproduction could influence evolution, but he questioned Darwin's emphasis on female aesthetic choice as a major evolutionary force.

Their disagreement demonstrates that nineteenth-century evolutionary theory was never a single, completely unified doctrine. Darwin and Wallace agreed on the central importance of natural selection while continuing to debate how selection operated and how far its explanatory power extended.

=== Instinct, Intelligence, and Animal Minds ===

Wallace repeatedly examined the relationship between instinct and intelligence. He questioned explanations that automatically attributed complex animal behavior to inherited instinct and emphasized the importance of observation and experimentation.

Studies of animal cognition were important to Wallace because comparisons between humans and animals could reveal both evolutionary continuity and possible differences in mental capacity.

His discussions of birds, mammals, primates, insects, and other animals explored how behavior might arise from inherited tendencies, individual experience, learning, perception, and environmental pressures.

These questions had direct implications for human evolution. If sophisticated behavior could arise gradually through biological evolution and learning, apparent differences between humans and other animals might be differences of degree. Wallace nevertheless came to believe that certain dimensions of human consciousness and intellectual ability required additional explanation.

=== Spiritualism and Human Consciousness ===

Wallace's interest in spiritualism profoundly influenced his later interpretation of human evolution. Beginning during the 1860s, he investigated séances and reports of psychic phenomena and became convinced that at least some apparently supernatural events were genuine.

He believed such claims should be investigated empirically rather than rejected automatically because they conflicted with prevailing scientific theories. His writings on séances, mesmerism, psychic research, spirit photography, miracles, and spiritualism repeatedly emphasized what he considered the importance of direct evidence and testimony.

Wallace gradually incorporated spiritualism into his interpretation of human nature. He came to believe that consciousness could not be reduced entirely to material processes and that human intellectual and moral development pointed toward a broader purpose in evolution.

This position became controversial among scientists and created a lasting difference between Wallace's evolutionary philosophy and more strictly materialist interpretations of Darwinism.

Wallace nevertheless continued defending natural selection as a biological mechanism. He did not simply abandon evolutionary theory after accepting spiritualism. Instead, he attempted to combine natural selection with a wider philosophical system in which biological evolution prepared the conditions for the emergence of conscious and moral humanity.

=== Human Evolution and Social Progress ===

Wallace's evolutionary thought became increasingly connected with his political and social views. He believed environmental and social conditions strongly influenced human character and rejected attempts to explain poverty, inequality, or social disadvantage primarily through biological heredity.

His writings addressed land ownership, population, poverty, women's rights, marriage, education, colonialism, morality, economic inequality, and social reform.

Wallace argued that a more just society would allow human capacities to develop more fully. He often emphasized that improving social conditions could produce greater moral and intellectual progress without requiring coercive biological intervention.

This approach distinguished his social thought from interpretations of evolution that treated unrestricted competition as a desirable principle for organizing human society.

=== Wallace and Eugenics ===

Wallace strongly opposed coercive proposals to improve humanity through selective breeding. Although evolutionary ideas were increasingly being used by some thinkers to support eugenics, Wallace believed such programs misunderstood both human society and evolutionary processes.

He rejected the idea that governments or scientific authorities should determine who should reproduce. Instead, he argued that social reform, equality, education, economic security, and greater freedom—particularly greater independence for women in choosing partners—could improve future generations without coercive reproductive policies.

His position illustrates the diversity of political interpretations associated with evolutionary theory. Natural selection could be invoked to justify competition and biological hierarchy, but Wallace used evolutionary arguments to support social equality and criticize eugenic intervention.

=== Race, Colonialism, and Indigenous Peoples ===

Wallace's writings contain the racial vocabulary and hierarchical assumptions common in nineteenth-century European anthropology. These passages are important historical evidence but should not be treated as statements of modern scientific knowledge about human populations.

His views were also complicated. Wallace sometimes reproduced Victorian assumptions concerning supposed levels of civilization while simultaneously criticizing colonial abuses, dispossession, and destructive attempts to impose European institutions on Indigenous societies.

His observations of Indigenous populations in Southeast Asia, New Guinea, Australia, Polynesia, Africa, and the Americas influenced his thinking about migration, adaptation, population history, cultural change, and colonial expansion.

Modern historians therefore study Wallace both as a contributor to evolutionary anthropology and as a figure whose work reveals the broader relationship between nineteenth-century science, racial classification, empire, and social reform.

=== Wallace's Mature View of Humanity ===

Wallace continued developing his philosophy of human evolution throughout the late nineteenth and early twentieth centuries. Works such as ''Darwinism'', ''Man's Place in the Universe'', ''The World of Life'', and ''Social Environment and Moral Progress'' attempted to integrate biological evolution, human consciousness, morality, social development, and the broader history of life.

He remained committed to natural selection and regarded it as one of the fundamental mechanisms responsible for biological evolution. However, he increasingly interpreted evolution as part of a larger purposive process.

Human consciousness occupied a special position in this worldview. Wallace believed that the emergence of intellectual and moral beings could not be understood solely as an accidental consequence of material biological processes.

His later writings extended this idea beyond biology into cosmology. The suitability of Earth for life, the history of biological evolution, and the emergence of conscious humanity became interconnected elements of his interpretation of humanity's place in the universe.

=== Modern Historical Interpretation ===

Modern scholarship has substantially expanded the study of Wallace beyond the familiar story of his co-discovery of natural selection with Darwin.

Historians have investigated his contributions to anthropology, theories of human variation, opposition to eugenics, political radicalism, land reform, women's rights, spiritualism, psychical research, philosophy of science, biogeography, and social thought.

Scholars continue to debate whether Wallace's spiritualism represented a sharp break from his earlier evolutionary science or whether it developed naturally from philosophical commitments already present in his thinking.

Other research examines his role in Victorian racial science and the later political use of concepts associated with his biogeographical work. These studies place Wallace within the complicated history of anthropology, colonialism, racial classification, and evolutionary thought rather than portraying him solely as Darwin's forgotten rival.

Modern historical research also emphasizes that Wallace's disagreements with Darwin were scientifically and philosophically substantive. Sexual selection, human mental evolution, heredity, adaptation, social progress, and the relationship between natural law and consciousness all became areas in which Wallace developed distinctive positions.

=== Scientific Legacy ===

Wallace's work occupies an important place in the history of evolutionary explanations of humanity. His early application of natural selection to human populations helped extend evolutionary reasoning into anthropology, while his later doubts about the sufficiency of natural selection for explaining the human mind stimulated debate over the limits of evolutionary explanation.

Several elements of Wallace's work remain historically significant:

* He applied natural selection to questions of human variation and antiquity.
* He recognized that cultural and technological adaptation could alter biological selective pressures.
* He participated in early scientific debates about prehistoric humans and human migration.
* He compared human and animal intelligence in discussions of instinct and cognition.
* He challenged important parts of Darwin's theory of sexual selection.
* He opposed coercive eugenic programs.
* He emphasized environmental and social influences on human development.
* He attempted to reconcile evolutionary biology with a non-material interpretation of consciousness.

Not all of Wallace's conclusions have survived modern scientific scrutiny. His spiritualist and teleological explanations are not part of mainstream modern evolutionary biology, and the racial classifications used in Victorian anthropology do not correspond to contemporary understandings of human genetic variation.

Nevertheless, the development of his ideas provides an important case study in how evolutionary theory was extended from biological organisms to humanity, culture, psychology, morality, and society.

=== Conclusion ===

Alfred Russel Wallace was far more than the co-discoverer of natural selection. Human evolution remained one of the central problems of his intellectual life, linking his research in biology, anthropology, psychology, social reform, philosophy, and spiritualism.

His earliest writings attempted to explain human variation and antiquity through natural selection. His later work increasingly distinguished between the evolutionary origins of the human body and what he considered the exceptional development of the human mind. This disagreement with Darwin became one of the most important philosophical divisions between the two founders of natural-selection theory.

Wallace's writings also reveal the complicated intellectual world of nineteenth-century evolutionary science. Anthropology, racial classification, colonial encounters, archaeology, heredity, social reform, sexual selection, morality, consciousness, and spiritualism were often discussed together as scientists attempted to construct a comprehensive history of humanity.

Modern scholarship continues to reassess Wallace because his work raises enduring questions about the interaction of biological evolution, culture, intelligence, morality, environment, and society. His career demonstrates both the power of evolutionary explanations and the historical debates over how far those explanations can be extended when attempting to understand human beings.

**TOC**




=== Early Anthropology, Human Variation, and Natural Selection ===

1. [https://people.wku.edu/charles.smith/wallace/S161.htm | Alfred Russel Wallace | Nature / The Alfred Russel Wallace Page | 1870]
 Wallace reviews Francis Galton’s “Hereditary Genius,” engaging early arguments about inheritance, ability, social achievement, and the causes of intellectual differences among people.

2. [https://people.wku.edu/charles.smith/wallace/S164.htm | Alfred Russel Wallace | Contributions to the Theory of Natural Selection / The Alfred Russel Wallace Page | 1870]
 “On Instinct in Man and Animals” compares human and animal behavior and challenges explanations that attribute complex abilities automatically to inherited instinct.

3. [https://people.wku.edu/charles.smith/wallace/S146.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1869]
 Wallace’s discussion of geological climates and the origin of species contains an important transitional statement leading toward his later claim that ordinary natural selection could not adequately explain all human faculties.

4. [https://people.wku.edu/charles.smith/wallace/S150152.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1869]
 These remarks concerning theories of human degeneration illuminate Wallace’s rejection of simple narratives in which supposedly “primitive” peoples were merely degraded descendants of formerly civilized populations.

5. [https://people.wku.edu/charles.smith/wallace/S151.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1869]
 Wallace comments on cerebral structure and contemporary ideas about the brain, offering context for his developing argument about human intellectual abilities and evolutionary explanation.

6. [https://people.wku.edu/charles.smith/wallace/S153.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1869]
 “The Origin of Moral Intuitions” examines whether human morality can arise through evolutionary and social processes, a central issue in Wallace’s later disagreements with strictly materialistic accounts of human evolution.

7. [https://people.wku.edu/charles.smith/wallace/S155.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1869]
 Wallace discusses controversies surrounding species origins and natural selection during the period when evolutionary theory was rapidly expanding into anthropology and psychology.

8. [https://people.wku.edu/charles.smith/wallace/S142AA.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1868]
 Wallace’s comments on the races and antiquity of mankind show his continued engagement with evidence concerning ancient humans and the evolutionary relationships among living populations.

9. [https://people.wku.edu/charles.smith/wallace/S082.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page / Transactions of the Ethnological Society of London | 1864/1865]
 In “On the Varieties of Man in the Malay Archipelago,” Wallace examines physical and cultural variation among peoples of the region and considers geography, migration, environment, and inherited differences.

10. [https://people.wku.edu/charles.smith/wallace/S104.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1865]
 “On the Progress of Civilisation in Northern Celebes” connects Wallace’s field observations with questions about cultural change, social organization, colonial contact, and differing paths of human development.

11. [https://people.wku.edu/charles.smith/wallace/S113orig.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1865]
 “How to Civilize Savages” illustrates Wallace’s critique of some colonial practices and provides context for his complicated Victorian ideas about Indigenous societies, morality, and social development.

12. [https://people.wku.edu/charles.smith/wallace/S087.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1864]
 Wallace comments on contact between what nineteenth-century anthropologists called “higher” and “lower” races, providing important evidence for reconstructing his early thinking about colonization, population change, and human diversity.

13. [https://people.wku.edu/charles.smith/wallace/S090.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1864]
 Wallace’s remarks during a discussion of anthropological research show him introducing natural selection into contemporary debates about human populations and their historical development.

14. [https://people.wku.edu/charles.smith/wallace/S092.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1864]
 Wallace discusses a Neanderthal skull at a time when European scientists were beginning to integrate fossil humans into theories concerning human antiquity and evolution.

15. [https://people.wku.edu/charles.smith/wallace/S093.htm | Alfred Russel Wallace | Journal of the Anthropological Society of London / The Alfred Russel Wallace Page | 1864]
 “The Origin of Human Races and the Antiquity of Man Deduced from the Theory of ‘Natural Selection’” is Wallace’s foundational application of natural selection directly to human evolution and population differentiation.

16. [https://wallace-online.org/content/contentblock?basepage=1&hitpage=27&itemID=S093&viewtype=side | Alfred Russel Wallace | Wallace Online | 1864]
 Wallace Online provides a scholarly digital version of Wallace’s major 1864 paper connecting natural selection, human antiquity, racial differentiation, technology, intellect, and changing selective pressures.

17. [https://digitalcommons.wku.edu/dlps_fac_arw/6 | Alfred Russel Wallace | Western Kentucky University Digital Commons | 1864]
 This archival edition of “The Origin of Human Races” provides another accessible version of Wallace’s early attempt to explain human physical differentiation through evolutionary processes.

18. [https://commons.wikimedia.org/wiki/File:The_Origin_of_Human_Races_and_the_Antiquity_of_Man_Deduced_from_the_Theory_of_%22Natural_Selection%22_(IA_jstor-3025211).pdf | Alfred Russel Wallace | Wikimedia Commons / Journal of the Anthropological Society of London | 1864]
 A scanned historical edition allows comparison with transcriptions and preserves the original context in which Wallace presented his evolutionary explanation of human racial differentiation.

19. [https://people.wku.edu/charles.smith/wallace/S094.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1864]
 Wallace’s discussion of instinct is relevant to human evolution because it addresses the distinction between inherited behavior, intelligence, learning, and adaptive responses.

20. [https://people.wku.edu/charles.smith/wallace/S095.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1864]
 Wallace’s comments during a discussion of the “Negro Race” document Victorian racial terminology and assumptions while revealing his own attempts to interpret population differences historically rather than as separately created types.

=== The Human Mind, Darwin, and the Limits of Natural Selection ===

21. [https://darwin-online.org.uk/converted/Ancillary/1895_NaturalSelection_A238.html | Alfred Russel Wallace | The Complete Work of Charles Darwin Online | 1895]
 This later collection of Wallace’s natural-selection essays makes it possible to compare his mature evolutionary thinking with the earlier papers from which his views of human evolution developed.

22. [https://www.nature.com/articles/024242a0 | Alfred Russel Wallace | Nature | 1881]
 Wallace’s “Anthropology” surveys important questions in the emerging science of humanity and helps place his evolutionary work within broader nineteenth-century anthropological research.

23. [https://people.wku.edu/charles.smith/wallace/S257.htm | Alfred Russel Wallace | British Association for the Advancement of Science / The Alfred Russel Wallace Page | 1876]
 “The Rise and Progress of Modern Views as to the Antiquity and Origin of Man” surveys the evidence that transformed nineteenth-century understanding of humanity’s deep past.

24. [https://www.nature.com/articles/015174a0 | Alfred Russel Wallace | Nature | 1876]
 Wallace’s review of Oscar Peschel’s “The Races of Man” provides insight into his thinking about physical anthropology, population classification, migration, and the historical relationships among human groups.

25. [https://people.wku.edu/charles.smith/wallace/S237.htm | Alfred Russel Wallace | The Academy / The Alfred Russel Wallace Page | 1874]
 “The Origin of Man and of Civilisation” reviews work on humans and apes while discussing anatomical continuity, human origins, and explanations for the development of civilization.

26. [https://people.wku.edu/charles.smith/wallace/S243.htm | Alfred Russel Wallace | Fortnightly Review / The Alfred Russel Wallace Page | 1874]
 “A Defence of Modern Spiritualism” presents Wallace’s mature arguments for spiritualism, a major influence on his belief that the human mind could not be reduced entirely to biological evolution.

27. [https://people.wku.edu/charles.smith/wallace/S245.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1874]
 “Automatism of Animals” addresses whether animal behavior and consciousness can be explained mechanically, bearing directly on Victorian debates over the uniqueness of human consciousness.

28. [https://people.wku.edu/charles.smith/wallace/S207.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1872]
 Wallace reviews Tylor’s “Primitive Culture,” engaging theories about religion, social development, cultural survivals, and the evolution of human thought.

29. [https://people.wku.edu/charles.smith/wallace/S208.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1872]
 “Ethnology and Spiritualism” explicitly brings Wallace’s anthropological interests into contact with his spiritualist convictions and his ideas about the nature of human beings.

30. [https://people.wku.edu/charles.smith/wallace/S180.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1871]
 “The Intelligence and Perfectibility of Animals” considers animal cognition and its limits, providing a useful comparison with Wallace’s ideas about distinctively human mental development.

31. [https://people.wku.edu/charles.smith/wallace/S186.htm | Alfred Russel Wallace | The Academy / The Alfred Russel Wallace Page | 1871]
 Wallace reviews Darwin’s “The Descent of Man,” making this an especially valuable contemporary record of agreements and disagreements between the two co-discoverers of natural selection.

32. [https://people.wku.edu/charles.smith/wallace/S191.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1871]
 “On the Attitude of Men of Science Towards the Investigators of Spiritualism” shows Wallace arguing that unusual claims about consciousness should receive empirical investigation rather than automatic dismissal.

33. [https://people.wku.edu/charles.smith/wallace/S165.htm | Alfred Russel Wallace | Contributions to the Theory of Natural Selection / The Alfred Russel Wallace Page | 1870]
 “The Limits of Natural Selection as Applied to Man” is crucial for understanding Wallace’s mature position that natural selection could explain the human body but not, in his view, the full development of certain intellectual, mathematical, artistic, moral, and spiritual capacities.

34. [https://www.cambridge.org/core/books/abs/contributions-to-the-theory-of-natural-selection/limits-of-natural-selection-as-applied-to-man/ | Alfred Russel Wallace | Cambridge University Press | 1870]
 Cambridge’s edition of Wallace’s famous chapter provides a scholarly route to his argument that certain human mental faculties appeared greater than survival requirements alone seemed to demand.

35. [https://people.wku.edu/charles.smith/wallace/S167.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1870]
 Wallace’s response to T. H. Huxley’s ethnographic work provides additional evidence for his opinions about human classification, variation, and the relationship between biological anthropology and evolutionary theory.

36. [https://people.wku.edu/charles.smith/wallace/S169.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1870]
 Wallace’s review of E. B. Tylor’s research on early humanity engages the development of culture, technology, belief, and social institutions as evidence for reconstructing human history.

37. [https://people.wku.edu/charles.smith/wallace/S173.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1870]
 “Man and Natural Selection” addresses criticism of Wallace’s position and helps clarify how he distinguished the evolution of the human organism from the origins of higher mental abilities.

38. [https://people.wku.edu/charles.smith/wallace/S174.htm | Alfred Russel Wallace | The Spiritualist / The Alfred Russel Wallace Page | 1870]
 Wallace challenges philosophical objections to miracles and supernatural phenomena, illustrating the spiritualist framework that became increasingly connected to his interpretation of human consciousness.

39. [https://www.gutenberg.org/cache/epub/22428/pg22428-images.html | Alfred Russel Wallace | Project Gutenberg | 1870]
 “Contributions to the Theory of Natural Selection” collects several of Wallace’s major evolutionary essays, including his influential treatment of instinct and the limits of natural selection when applied to humans.

40. [https://wallace-online.org/content/contentblock?basepage=1&hitpage=264&itemID=S716&viewtype=side | Alfred Russel Wallace | Wallace Online | 1870]
 Wallace Online’s edition of “Contributions to the Theory of Natural Selection” allows Wallace’s human-evolution arguments to be studied within the broader structure of his evolutionary theory.

=== Later Human Evolution, Society, Race, and Purpose ===

41. [https://people.wku.edu/charles.smith/wallace/S706.htm | Alfred Russel Wallace | The Spectator / The Alfred Russel Wallace Page | 1913]
 “Dr. Wallace on the Genesis of the Soul” gives an unusually explicit statement of Wallace’s late belief that biological development eventually permitted the introduction of a spiritual nature into humanity.

42. [https://www.gutenberg.org/files/50289/50289-h/50289-h.htm | Alfred Russel Wallace | Project Gutenberg | 1913]
 “Social Environment and Moral Progress” argues that human moral and social development depends strongly on institutions and environment rather than simply on biological heredity or competitive selection.

43. [https://people.wku.edu/charles.smith/wallace/S669.htm | Alfred Russel Wallace | Fortnightly Review / The Independent / The Alfred Russel Wallace Page | 1909]
 “The World of Life: As Visualised and Interpreted by Darwinism” combines Wallace’s continuing defense of natural selection with his belief that life and consciousness ultimately pointed toward purposive organization.

44. [https://people.wku.edu/charles.smith/wallace/S676.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1909]
 Wallace’s note on Malthus documents the population arguments that helped inspire the theory of natural selection and therefore shaped his earliest evolutionary reasoning about humans as well as other organisms.

45. [https://people.wku.edu/charles.smith/wallace/S649.htm | Alfred Russel Wallace | Fortnightly Review / The Alfred Russel Wallace Page | 1908]
 “Evolution and Character” examines heredity, environment, morality, education, and human behavior while challenging attempts to explain social outcomes through heredity alone.

46. [https://people.wku.edu/charles.smith/wallace/S660.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1908]
 “The Present Position of Darwinism” reviews the status of evolutionary theory half a century after natural selection was announced and restates Wallace’s distinctive interpretation of Darwinism.

47. [https://people.wku.edu/charles.smith/wallace/S630.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1906]
 “The Native Problem in South Africa and Elsewhere” provides evidence of Wallace’s later thinking about colonialism, Indigenous populations, racial politics, land, and unequal social systems.

48. [https://people.wku.edu/charles.smith/wallace/S602.htm | Alfred Russel Wallace | The Independent and Fortnightly Review / The Alfred Russel Wallace Page | 1903]
 “Man’s Place in the Universe” extends Wallace’s interpretation of human significance beyond biological evolution into astronomy, life, consciousness, and humanity’s position in the cosmos.

49. [https://people.wku.edu/charles.smith/wallace/S606.htm | Alfred Russel Wallace | Fortnightly Review and The Independent / The Alfred Russel Wallace Page | 1903]
 Wallace replies to critics of “Man’s Place in the Universe,” clarifying arguments that later became part of his broader teleological interpretation of life and human development.

50. [https://people.wku.edu/charles.smith/wallace/S728-1.htm | Alfred Russel Wallace | McClure, Phillips & Co. / The Alfred Russel Wallace Page | 1903]
 The complete “Man’s Place in the Universe” develops Wallace’s argument that scientific findings about Earth, life, and humanity were compatible with a special place for conscious beings in cosmic history.

51. [https://people.wku.edu/charles.smith/wallace/S589.htm | Alfred Russel Wallace | The Sun / The Progress of the Century / The Alfred Russel Wallace Page | 1900/1901]
 In “Evolution,” Wallace surveys the nineteenth-century triumph of evolutionary thought and discusses its implications for understanding life and humanity.

52. [https://people.wku.edu/charles.smith/wallace/S583.htm | Alfred Russel Wallace | Studies Scientific and Social / The Alfred Russel Wallace Page | 1900]
 “Affinities and Origin of the Australian and Polynesian Races” documents Wallace’s later ideas about migration, human antiquity, physical anthropology, mixture, and population relationships.

53. [https://people.wku.edu/charles.smith/wallace/S545.htm | Alfred Russel Wallace | Light / The Alfred Russel Wallace Page | 1898]
 “Spiritualism and Social Duty” connects Wallace’s spiritual beliefs with his social reform agenda and his conviction that human moral development had purposes beyond material competition.

54. [https://people.wku.edu/charles.smith/wallace/S549.htm | Alfred Russel Wallace | The Eagle and the Serpent / The Alfred Russel Wallace Page | 1898]
 “Darwinism in Sociology” rejects simplistic efforts to turn survival of the fittest into a political doctrine justifying domination, hereditary privilege, or unrestricted social competition.

55. [https://people.wku.edu/charles.smith/wallace/S527.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1896]
 “The Problem of Utility” explores whether evolutionary characters must always possess adaptive value, a question closely connected to Wallace’s reasoning about seemingly excessive human capacities.

56. [https://people.wku.edu/charles.smith/wallace/S445.htm | Alfred Russel Wallace | The Arena / The Alfred Russel Wallace Page | 1892]
 “Human Progress: Past and Future” links biological history with social evolution and argues that the future development of humanity depends heavily on reforming social conditions.

57. [https://people.wku.edu/charles.smith/wallace/S439.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1891]
 Wallace’s introductory note to Edward Westermarck’s “The History of Human Marriage” connects his evolutionary interests with comparative research on mating, marriage, sexuality, and human social institutions.

58. [https://people.wku.edu/charles.smith/wallace/S427.htm | Alfred Russel Wallace | Fortnightly Review / The Alfred Russel Wallace Page | 1890]
 “Human Selection” attacks coercive schemes for improving humanity and argues that social reform and greater freedom in mate choice could shape future human development.

59. [https://en.wikisource.org/wiki/Popular_Science_Monthly/Volume_38/November_1890/Human_Selection | Alfred Russel Wallace | Popular Science Monthly / Wikisource | 1890]
 This contemporary reprinting of “Human Selection” makes Wallace’s ideas about marriage, inequality, sexual choice, social reform, and future human evolution readily accessible.

60. [https://people.wku.edu/charles.smith/wallace/S724CH15.htm | Alfred Russel Wallace | Darwinism / The Alfred Russel Wallace Page | 1889]
 “Darwinism Applied to Man” is one of Wallace’s fullest mature statements on human ancestry, ape-human similarities, the antiquity of humanity, brain evolution, and his contention that certain mental faculties exceed what natural selection alone can explain.

=== Darwin, Wallace, and Nineteenth-Century Context ===

61. [https://www.gutenberg.org/ebooks/34967 | Charles Darwin | Project Gutenberg | 1871]
 Volume I of Darwin’s “The Descent of Man” provides the major contemporary evolutionary treatment against which Wallace’s ideas about human origins, mental evolution, sexual selection, and racial variation can be compared.

62. [https://www.gutenberg.org/ebooks/36520 | Charles Darwin | Project Gutenberg | 1871]
 Volume II of “The Descent of Man” develops Darwin’s sexual-selection argument, one of the most important areas of disagreement between Darwin and Wallace concerning human and animal traits.

63. [https://www.biodiversitylibrary.org/item/105592 | St. George Jackson Mivart | Biodiversity Heritage Library | 1871]
 “On the Genesis of Species” criticized aspects of Darwinian natural selection and belongs to the wider Victorian debate in which Wallace refined his own views concerning selection and humanity.

64. [https://www.darwinproject.ac.uk/letters/darwins-life-letters/darwin-letters1870-human-evolution | Darwin Correspondence Project | University of Cambridge | 1870 correspondence]
 Darwin’s 1870 correspondence captures debates over human ancestry, morality, mental abilities, and sexual selection shortly before publication of “The Descent of Man.”

65. [https://galton.org/books/hereditary-genius/ | Francis Galton | Galton.org | 1869]
 “Hereditary Genius” proposed strong hereditary explanations for intellectual achievement and became an important point of reference for Wallace’s later opposition to eugenic approaches to human improvement.

66. [https://www.darwinproject.ac.uk/letters/darwins-life-letters/darwin-letters-1868-studying-sex | Darwin Correspondence Project | University of Cambridge | 1868 correspondence]
 Darwin’s correspondence from 1868 documents the development of his sexual-selection research and exchanges with Wallace while Darwin was preparing his work on human evolution.

67. [https://darwin-editorial.darwinproject.ac.uk/view/letters/DCP-LETT-4510 | Charles Darwin | Darwin Correspondence Project | 28 May 1864]
 Darwin’s correspondence with Wallace shortly after Wallace’s human-races paper provides direct evidence of how their discussions about natural selection expanded into the problem of human evolution.

68. [https://www.gutenberg.org/ebooks/2931 | Thomas Henry Huxley | Project Gutenberg | 1863]
 “Evidence as to Man’s Place in Nature” compares human and ape anatomy and represents a major early scientific argument for placing humans within evolutionary natural history.

69. [https://en.wikisource.org/wiki/Geological_Evidences_of_the_Antiquity_of_Man | Charles Lyell | Wikisource | 1863]
 Lyell’s “Geological Evidences of the Antiquity of Man” synthesized archaeological, geological, and fossil evidence showing that human history extended much further into the past than traditional chronologies allowed.

70. [https://www.darwinproject.ac.uk/alfred-russel-wallace | Darwin Correspondence Project | University of Cambridge | Current scholarly resource]
 This overview traces Darwin and Wallace’s scientific relationship and highlights their disputes concerning human mental evolution, sexual selection, and Wallace’s increasing commitment to spiritualism.

71. [https://www.darwinproject.ac.uk/commentary/evolution/sexual-selection | Darwin Correspondence Project | University of Cambridge | Current scholarly resource]
 This resource explains Darwin’s theory of sexual selection and provides essential context for understanding why Wallace eventually rejected important parts of Darwin’s explanation of ornamentation and human differences.

72. [https://www.darwinproject.ac.uk/descent | Darwin Correspondence Project | University of Cambridge | Scholarly project]
 The “Descent of Man” project supplies correspondence and historical background useful for comparing Darwin’s naturalistic account of human evolution with Wallace’s increasingly different interpretation.

73. [https://en.wikisource.org/wiki/Author:Alfred_Russel_Wallace | Alfred Russel Wallace | Wikisource | Nineteenth–twentieth centuries]
 Wikisource’s Wallace collection provides access to multiple primary texts and offers a useful gateway for locating contemporary editions of writings relevant to evolution, humanity, and natural selection.

74. [https://people.wku.edu/charles.smith/wallace/chronol.htm | Charles H. Smith | The Alfred Russel Wallace Page | Scholarly chronology]
 The detailed chronology helps place Wallace’s changing views of anthropology, spiritualism, social reform, and human evolution alongside his publications, travels, correspondence, and personal experiences.

75. [https://people.wku.edu/charles.smith/wallace/BIOG.htm | Charles H. Smith | The Alfred Russel Wallace Page | Scholarly biography]
 This biographical overview summarizes Wallace’s contributions to evolutionary biology, biogeography, anthropology, social thought, and spiritualism.

76. [https://people.wku.edu/charles.smith/wallace/FAQ.htm | Charles H. Smith | The Alfred Russel Wallace Page | Scholarly reference]
 The Wallace FAQ addresses recurring historical questions about his relationship with Darwin, spiritualism, natural selection, human evolution, and alleged changes in his evolutionary beliefs.

77. [https://people.wku.edu/charles.smith/wallace/threads.htm | Charles H. Smith | The Alfred Russel Wallace Page | Scholarly research resource]
 “Wallace-Related Research Threads” identifies interconnected areas of scholarship, including anthropology, evolutionary theory, human origins, spiritualism, social reform, biogeography, and intellectual history.

78. [https://people.wku.edu/charles.smith/wallace/writings.htm | Charles H. Smith | The Alfred Russel Wallace Page | Bibliographic database]
 This chronological collection of Wallace’s writings is particularly useful for following the development of his human-evolution ideas from the early 1860s through his final writings.

79. [https://www.nhm.ac.uk/discover/who-was-alfred-russel-wallace.html | Natural History Museum | Natural History Museum, London | Current reference]
 The Natural History Museum provides an accessible overview of Wallace’s independent discovery of natural selection, field research, relationship with Darwin, and broader scientific career.

80. [https://academic.oup.com/biolinnean/pages/alfred_russel_wallace | Multiple authors | Biological Journal of the Linnean Society / Oxford Academic | Scholarly collection]
 This Wallace-focused scholarly collection brings together research on his evolutionary thought and legacy and provides useful pathways into specialist literature beyond standard Darwin-centered histories.

=== Modern Scholarship on Wallace and Human Evolution ===

81. [https://link.springer.com/article/10.1007/s10739-024-09792-6 | David Stack | Journal of the History of Biology | 2024]
 “Alfred Russel Wallace’s Darwinian Opposition to Eugenics” shows how Wallace used evolutionary reasoning to oppose eugenics and challenged attempts to apply selective breeding programs to humans.

82. [https://arbor.revistas.csic.es/index.php/arbor/user/setLocale/en_US?source=%2Findex.php%2Farbor%2Farticle%2Fview%2F2379 | Juan Manuel Rodríguez Caso | Arbor | 2020]
 “Alfred Russel Wallace, Anthropologist: Contributions to Physical Anthropology” reassesses Wallace’s significant but often overlooked role in nineteenth-century physical anthropology and studies of human variation.

83. [https://pmc.ncbi.nlm.nih.gov/articles/PMC7329216/ | Fenneke Sysling | Medical History | 2019]
 “The Human Wallace Line: Racial Science and Political Afterlife” investigates the use of Wallace’s biogeographical boundary in later racial anthropology and the political implications of attempts to map biological boundaries onto human populations.

84. [https://www.cambridge.org/core/journals/modern-intellectual-history/article/abs/credible-witnessing-a-r-wallace-spiritualism-and-a-new-branch-of-anthropology/24BDED3F341325758CB186CF1245F195 | Efram Sera-Shriar | Modern Intellectual History | 2018]
 “Credible Witnessing” examines Wallace’s spiritualist investigations as an attempted new form of anthropological inquiry and considers his ideas about evidence, testimony, consciousness, and unseen human capacities.

85. [https://pubmed.ncbi.nlm.nih.gov/25424743/ | Charles H. Smith | Journal of the History of Biology | 2015]
 “Alfred Russel Wallace and the Road to Natural Selection, 1844–1858” reconstructs the intellectual development that produced Wallace’s theory of natural selection and provides background for its later application to humans.

86. [https://www.sciencedirect.com/science/article/pii/S1369848615000370 | John van Wyhe and Peter C. Kjærgaard | Studies in History and Philosophy of Biological and Biomedical Sciences | 2015]
 “Going the Whole Orang: Darwin, Wallace and the Natural History of Orangutans” compares Darwin’s encounters with captive orangutans and Wallace’s field observations in Borneo, showing how great apes helped shape nineteenth-century thinking about human evolution.

87. [https://pubmed.ncbi.nlm.nih.gov/23982797/ | Ulrich Kutschera and Uwe Hossfeld | Theory in Biosciences | 2013]
 This study reassesses Wallace as a major evolutionary theorist and highlights his role in developing natural-selection theory, providing context for understanding both his agreements and later disagreements with Darwin.

88. [https://pubmed.ncbi.nlm.nih.gov/20889963/ | Charles G. Gross | The Neuroscientist | 2010]
 “Alfred Russell Wallace and the Evolution of the Human Mind” examines Wallace’s claim that natural selection could not account fully for the human brain and higher intellectual abilities.

89. [https://pubmed.ncbi.nlm.nih.gov/20503822/ | Jeremy Vetter | Notes and Records of the Royal Society | 2010]
 “The Unmaking of an Anthropologist: Wallace Returns from the Field, 1862–70” analyzes Wallace’s changing relationship with anthropology after returning from the Malay Archipelago and his movement toward broader evolutionary and spiritual questions.

90. [https://academic.oup.com/book/51208/chapter-abstract/422159012 | Charles H. Smith | Natural Selection and Beyond | 2008]
 “Wallace, Spiritualism, and Beyond: ‘Change,’ or ‘No Change’?” evaluates whether Wallace’s spiritualism represented a sharp break with his earlier science or developed from long-standing features of his worldview.

91. [https://academic.oup.com/chicago-scholarship-online/book/22220/chapter-abstract/182389941 | Martin Fichman | An Elusive Victorian | 2004]
 “Wallace’s Evolutionary Philosophy” reconstructs the broader intellectual system within which Wallace understood natural selection, human development, morality, and purposeful evolution.

92. [https://academic.oup.com/chicago-scholarship-online/book/22220/chapter-abstract/182391604 | Martin Fichman | An Elusive Victorian | 2004]
 “The Making of a Victorian Spiritualist” explores how Wallace came to accept spiritualism and why he believed it could coexist with empirical science and evolutionary theory.

93. [https://academic.oup.com/chicago-scholarship-online/book/22220/chapter/182395985 | Martin Fichman | An Elusive Victorian | 2004]
 “Toward a Synthesis: Wallace’s Theistic Evolutionary Teleology” analyzes Wallace’s mature effort to combine Darwinian evolution with a universe directed toward the emergence and development of conscious humanity.

94. [https://www.cambridge.org/core/journals/british-journal-for-the-history-of-science/article/abs/alfred-russel-wallace-robert-owen-and-the-theory-of-natural-selection/E7A5E8D68B88AA2D2EEA8730E41933F4 | Greta Jones | British Journal for the History of Science | 2002]
 Jones examines the influence of Robert Owen and social reform ideas on Wallace, helping explain why his evolutionary thinking about humanity differed from more competitive interpretations of Darwinism.

95. [https://www.journals.uchicago.edu/doi/abs/10.1086/649346 | Martin Fichman | Osiris | 2001]
 “Science in Theistic Contexts: A Case Study of Alfred Russel Wallace on Human Evolution” examines Wallace’s attempt to combine evolutionary science with a purposive or theistic interpretation of human origins.

96. [https://people.wku.edu/charles.smith/essays/ARWPAMPH.htm | Charles H. Smith | The Alfred Russel Wallace Page | 1992/revised 1999]
 “Alfred Russel Wallace on Spiritualism, Man, and Evolution” analyzes the relationship between Wallace’s spiritual beliefs and his distinctive interpretation of human evolutionary development.

97. [https://academic.oup.com/book/10940/chapter-abstract/159215410 | Carl N. Degler | In Search of Human Nature | 1993]
 “Laying the Foundation” places Darwin, Wallace, and other nineteenth-century thinkers within the emergence of evolutionary explanations for human behavior, heredity, and social organization.

98. [https://www.journals.uchicago.edu/doi/abs/10.1086/351256 | Malcolm Jay Kottler | Isis | 1974]
 “Alfred Russel Wallace, the Origin of Man, and Spiritualism” is a major historical study of the connection between Wallace’s evolutionary reasoning, his interpretation of human mental faculties, and his adoption of spiritualism.

99. [https://www.jstor.org/stable/j.ctv2zt9mtm | Efram Sera-Shriar | Psychic Investigators | Modern scholarly study]
 This study places Wallace’s spiritualist research within Victorian anthropology and examines how investigators attempted to establish credible evidence for phenomena they believed might reveal otherwise unknown aspects of human nature.

100. [https://people.wku.edu/charles.smith/essays/WALLMO.htm | Charles H. Smith | The Alfred Russel Wallace Page | Scholarly essay]
 “Wallace’s ‘Second Moment’: Intelligent Conviction and the Course of Human Evolution” explores the intellectual transition that led Wallace to propose additional agency in the emergence of higher human faculties.

=== Anthropology, Human Variation, and Prehistory ===

101. [https://people.wku.edu/charles.smith/wallace/S406.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1887]
 "The Antiquity of Man in North America" examines archaeological and geological claims for an ancient human presence in the Americas.

102. [https://people.wku.edu/charles.smith/wallace/S396A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1887]
 Wallace's remarks concerning Native Americans provide evidence for his later views on Indigenous peoples, human diversity, European expansion, and cultural change.

103. [https://people.wku.edu/charles.smith/wallace/S342.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1881]
 Wallace reviews Carl Bock's "The Head-hunters of Borneo," providing another window into his interpretations of Indigenous societies in the Malay Archipelago.

104. [https://people.wku.edu/charles.smith/wallace/S332.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1880]
 Wallace reviews Luigi Maria d'Albertis's account of New Guinea, assessing observations concerning the island's Indigenous peoples as well as its natural history.

105. [https://people.wku.edu/charles.smith/wallace/S296.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1879]
 Wallace discusses S. J. Whitmee's proposed ethnographic nomenclature for Australasia and the problems involved in classifying diverse human populations.

106. [https://people.wku.edu/charles.smith/wallace/S297.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1879]
 Wallace comments on a paper concerning New Guinea tribes, drawing on his experience in the region and engaging questions of population relationships and cultural diversity.

107. [https://people.wku.edu/charles.smith/wallace/S301.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1879]
 "New Guinea and Its Inhabitants" combines geography and ethnography to examine the peoples of New Guinea, their environments, material cultures, and relationships with neighboring populations.

108. [https://people.wku.edu/charles.smith/wallace/S320.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1879]
 Wallace discusses the Dutch expedition to Central Sumatra, including observations relevant to the ethnography and geographic distribution of human populations in the region.

109. [https://people.wku.edu/charles.smith/wallace/S258A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1876]
 Wallace comments on the Rodiyas of Ceylon, illustrating nineteenth-century ethnographic discussions about caste, social isolation, population history, and cultural differences.

110. [https://people.wku.edu/charles.smith/wallace/S248C.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1875]
 Wallace's letter on the antiquity of humanity addresses evidence concerning the chronology of human existence and its implications for theories of human development.

111. [https://people.wku.edu/charles.smith/wallace/S233.htm | Alfred Russel Wallace | The Academy / The Alfred Russel Wallace Page | 1873]
 Wallace reviews a new edition of Charles Lyell's "Antiquity of Man," discussing evidence for prehistoric humanity and the relationship between geology, archaeology, and evolutionary theory.

112. [https://people.wku.edu/charles.smith/wallace/S234.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1873]
 "A Primeval Race" considers archaeological and anthropological evidence used to reconstruct the characteristics and ways of life of ancient human populations.

113. [https://people.wku.edu/charles.smith/wallace/S197.htm | Alfred Russel Wallace | Nature / The Alfred Russel Wallace Page | 1871]
 Wallace responds to Henry Howorth's criticism of Darwinism and defends evolutionary reasoning against arguments challenging natural selection and common descent.

114. [https://people.wku.edu/charles.smith/wallace/S159.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1870]
 "The Measurement of Geological Time" is relevant to human evolution because Wallace examined the vast chronological framework necessary for evolutionary change and human antiquity.

115. [https://people.wku.edu/charles.smith/wallace/S171A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1870]
 Wallace comments on evolutionary succession and the interpretation of historical sequences, illustrating his broader reasoning about descent and biological transformation through deep time.

116. [https://people.wku.edu/charles.smith/wallace/S125.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1867]
 "Mr. Wallace on Natural Selection Applied to Anthropology" directly addresses the use of natural selection to explain human development and clarifies aspects of his early evolutionary anthropology.

117. [https://people.wku.edu/charles.smith/wallace/S131.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1867]
 "The Polynesians and Their Migrations" evaluates evidence concerning settlement, migration, physical differences, language, and the historical relationships of Pacific peoples.

118. [https://people.wku.edu/charles.smith/wallace/S133.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1867]
 Wallace's comments on phrenology show his continuing interest in theories attempting to associate brain structure with human character and intellectual capacities.

119. [https://people.wku.edu/charles.smith/wallace/Races_of_Man.htm | Alfred Russel Wallace | Public Lecture / The Alfred Russel Wallace Page | 1867]
 "On the Races of Man in the Malay Archipelago" summarizes Wallace's field observations of human diversity and discusses population distributions, migration, physical appearance, and culture.

120. [https://people.wku.edu/charles.smith/wallace/S119.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1866]
 Wallace's address on anthropology discusses the emerging scientific study of humanity and the evidence available for reconstructing human physical and cultural history.

121. [https://people.wku.edu/charles.smith/wallace/S120.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1866]
 "Anthropology at the British Association" reports on contemporary investigations of human origins, racial classification, archaeology, language, and cultural development.

122. [https://people.wku.edu/charles.smith/wallace/S122.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1866]
 Wallace comments on flint implements discovered in North Devon, contributing to contemporary debates over prehistoric humans and the great antiquity of human occupation.

123. [https://people.wku.edu/charles.smith/wallace/S106.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page / Anthropological Society of London | 1865]
 Wallace's comments on phallic worship illustrate his participation in early comparative anthropology and Victorian attempts to reconstruct the origins and development of religious customs.

124. [https://people.wku.edu/charles.smith/wallace/S111.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page / Anthropological Society of London | 1865]
 Wallace discusses missionary activity among Indigenous peoples, providing evidence for his attitudes toward cultural change, colonialism, religion, and supposedly "civilizing" influences.

125. [https://people.wku.edu/charles.smith/wallace/S113A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page / Anthropological Society of London | 1865]
 Wallace comments on craniology and phrenology in relation to ethnology, revealing how he evaluated nineteenth-century attempts to connect skull form, mental traits, and human population differences.

=== Mind, Consciousness, Instinct, and Spiritualism ===

126. [https://people.wku.edu/charles.smith/wallace/S268A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1877]
 This letter explicitly clarifies Wallace's position on Darwinism and spiritualism and is valuable for assessing whether his later ideas represented a rejection or modification of evolutionary theory.

127. [https://people.wku.edu/charles.smith/wallace/S270.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1877]
 Wallace's extensive review of Carpenter's work on mesmerism and spiritualism develops his argument about evidence, unconscious action, consciousness, and unexplained phenomena.

128. [https://people.wku.edu/charles.smith/wallace/S283.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1877]
 "Psychological Curiosities of Scepticism" defends Wallace's approach to psychical research and illustrates how his concept of the human mind diverged from strict materialism.

129. [https://people.wku.edu/charles.smith/wallace/S253.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1876]
 Wallace reviews St. George Mivart's "Lessons from Nature, As Manifested in Mind and Matter," addressing competing interpretations of evolution, consciousness, and materialism.

130. [https://people.wku.edu/charles.smith/wallace/S258.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1876]
 Wallace's remarks on psychological experiments show his continuing interest in empirical approaches to unusual aspects of human perception and consciousness.

131. [https://people.wku.edu/charles.smith/wallace/S258AA.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1876]
 Wallace's discussion of the origin of instinct addresses how complex behavior might develop through natural selection, learning, inherited tendencies, or other processes.

132. [https://people.wku.edu/charles.smith/wallace/S263.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1876]
 Wallace disputes Carpenter's treatment of mesmerism, an important example of his resistance to explanations that he believed prematurely reduced psychological phenomena to error or deception.

133. [https://people.wku.edu/charles.smith/wallace/S264.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1876]
 Wallace continues his controversy with Carpenter over spiritualism and the standards of evidence appropriate for investigating consciousness.

134. [https://people.wku.edu/charles.smith/wallace/S266A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1876]
 Wallace's notes on George Harris's philosophical treatise on human nature address questions about mind, body, morality, and the constitution of humanity.

135. [https://people.wku.edu/charles.smith/wallace/S219.htm | Alfred Russel Wallace | The Times / The Alfred Russel Wallace Page | 1873]
 "Spiritualism and Science" argues that claims about psychic phenomena should be investigated rather than rejected solely because they conflict with prevailing theories.

136. [https://people.wku.edu/charles.smith/wallace/S220.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1873]
 Wallace reviews Darwin's "The Expression of the Emotions in Man and Animals," engaging Darwin's comparative approach to human and animal psychology.

137. [https://people.wku.edu/charles.smith/wallace/S222.htm | Alfred Russel Wallace | Nature / The Alfred Russel Wallace Page | 1873]
 "Inherited Feeling" examines whether apparently complex animal behavior results from inherited tendencies or individual perception and experience.

138. [https://people.wku.edu/charles.smith/wallace/S227.htm | Alfred Russel Wallace | Nature / The Alfred Russel Wallace Page | 1873]
 "Perception and Instinct in the Lower Animals" investigates cognition outside humanity and therefore helps define Wallace's conception of the evolutionary boundary between animal and human mentality.

139. [https://people.wku.edu/charles.smith/wallace/S206.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1872]
 "Dr. Carpenter and Psychic Force" challenges William Benjamin Carpenter's skeptical interpretation of alleged psychic phenomena and illustrates Wallace's disagreements with materialistic psychology.

140. [https://people.wku.edu/charles.smith/wallace/S209.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1872]
 Wallace reviews Robert Dale Owen's work on phenomena supposedly lying between the physical and spiritual worlds, connecting questions of evidence with human consciousness.

141. [https://people.wku.edu/charles.smith/wallace/S213.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1872]
 Wallace's discussion of the scientific value of beauty bears on his broader disagreement with explanations that reduced aesthetic perception solely to ordinary utility.

142. [https://people.wku.edu/charles.smith/wallace/S216.htm | Alfred Russel Wallace | Nature / The Alfred Russel Wallace Page | 1872]
 Wallace argues that instinct required far more experimental investigation, an issue central to distinguishing inherited behavior from intelligence, learning, and conscious choice.

143. [https://people.wku.edu/charles.smith/wallace/S217.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1872]
 Wallace reviews Jean-Charles Houzeau's comparative study of the faculties of humans and animals, directly engaging questions about cognitive continuity across species.

144. [https://people.wku.edu/charles.smith/wallace/S200A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1871]
 These letter excerpts respond to criticism of spiritualism and help document Wallace's attempt to reconcile evolutionary science with his interpretation of human consciousness.

145. [https://people.wku.edu/charles.smith/wallace/S141A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1868]
 "Spiritualism in Java" connects Wallace's earlier travels in Southeast Asia with his developing interest in reports of unusual psychological and spiritual phenomena.

146. [https://people.wku.edu/charles.smith/wallace/S142B.htm | Alfred Russel Wallace | Spiritual Magazine / The Alfred Russel Wallace Page | 1868]
 Wallace discusses spiritualism during the same period in which he was increasingly questioning whether natural selection alone explained all aspects of human mentality.

147. [https://people.wku.edu/charles.smith/wallace/S126.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1867]
 Wallace's postscript concerning a séance documents the period in which spiritualism increasingly influenced his ideas about consciousness and human nature.

148. [https://people.wku.edu/charles.smith/wallace/S132.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1867]
 Wallace records observations from a séance with Miss Nicholl, illustrating the empirical approach he believed could be applied to alleged psychic phenomena.

149. [https://people.wku.edu/charles.smith/wallace/S137.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1867]
 "Extraordinary Manifestations in London" reports phenomena Wallace interpreted as evidence that mind and consciousness might possess properties unexplained by conventional materialism.

150. [https://people.wku.edu/charles.smith/wallace/S118.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1866]
 "The Scientific Aspect of the Supernatural" is an early major statement of Wallace's belief that unusual mental and spiritual phenomena deserved empirical investigation.

=== Natural Selection, Sexual Selection, and Human Evolution ===

151. [https://people.wku.edu/charles.smith/wallace/S415.htm | Alfred Russel Wallace | Nature / The Alfred Russel Wallace Page | 1889]
 "Lamarck versus Weismann" addresses inheritance and the question of whether acquired characteristics contribute to evolutionary change.

152. [https://people.wku.edu/charles.smith/wallace/S419.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1889]
 Wallace applies natural-selection reasoning to aging and death, illustrating the broad evolutionary framework within which he interpreted human as well as animal life.

153. [https://people.wku.edu/charles.smith/wallace/S410.htm | Alfred Russel Wallace | Nature / The Alfred Russel Wallace Page | 1888]
 Wallace discusses John T. Gulick's work on divergent evolution, isolation, and the formation of species, mechanisms relevant to thinking about differentiation among human populations.

154. [https://people.wku.edu/charles.smith/wallace/S394.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1887]
 "The American School of Evolutionists" reviews evolutionary theories developed by American naturalists and compares them with Wallace's selection-centered approach.

155. [https://people.wku.edu/charles.smith/wallace/S397.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1887]
 Wallace reviews Edward Drinker Cope's "The Origin of the Fittest," engaging alternative ideas about adaptation and evolutionary mechanisms.

156. [https://people.wku.edu/charles.smith/wallace/S389.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1886]
 "Romanes Versus Darwin" examines George Romanes's evolutionary proposals and their relationship to Darwinian mechanisms.

157. [https://people.wku.edu/charles.smith/wallace/S358.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1883]
 "The Debt of Science to Darwin" assesses Darwin's intellectual achievements while also revealing Wallace's understanding of the broader significance of evolutionary theory.

158. [https://people.wku.edu/charles.smith/wallace/S368AB.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1883]
 Wallace comments on an unpublished Darwin paper concerning instinct, giving insight into how the two naturalists approached inherited behavior.

159. [https://people.wku.edu/charles.smith/wallace/S368AC.htm | Alfred Russel Wallace | Daily News / The Alfred Russel Wallace Page | 1883]
 "Man and Evolution" clarifies that Wallace did not reject evolutionary laws for the human mind but believed natural selection was insufficient as its exclusive explanation.

160. [https://people.wku.edu/charles.smith/wallace/S350.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1882]
 "Monkeys" surveys primate diversity and behavior, providing comparative biological context for nineteenth-century discussion of human ancestry.

161. [https://people.wku.edu/charles.smith/wallace/S352.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1882]
 Another review titled "The Theory of Descent" illustrates Wallace's continuing assessment of alternative evolutionary models after Darwin's major works had appeared.

162. [https://people.wku.edu/charles.smith/wallace/S338.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1881]
 Wallace's review "The Theory of Descent" evaluates contemporary evolutionary arguments and the mechanisms proposed to explain inherited biological change.

163. [https://people.wku.edu/charles.smith/wallace/S334A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1880]
 In a letter extract concerning Darwin, Wallace succinctly explains differences between his own and Darwin's interpretation of human evolution.

164. [https://people.wku.edu/charles.smith/wallace/S303.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1879]
 Wallace's review "Organisation and Intelligence" examines claims about relationships between biological organization and mental capacity, an important issue in theories of human evolution.

165. [https://people.wku.edu/charles.smith/wallace/S305.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1879]
 Wallace reviews Ernst Haeckel's "The Evolution of Man," directly engaging one of the nineteenth century's major evolutionary reconstructions of human ancestry.

166. [https://people.wku.edu/charles.smith/wallace/S314A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1879]
 Wallace's remarks on a gorilla at the Crystal Palace provide useful evidence for Victorian comparisons between great apes and humans.

167. [https://people.wku.edu/charles.smith/wallace/S221.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1873]
 "Modern Applications of the Doctrine of Natural Selection" evaluates efforts to extend evolutionary principles beyond the examples originally emphasized by Darwin and Wallace.

168. [https://people.wku.edu/charles.smith/wallace/S158A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1870]
 Wallace's discussion of butterfly coloration contributes to the wider debate over whether sexual differences arise primarily through natural or sexual selection.

169. [https://people.wku.edu/charles.smith/wallace/S175.htm | Alfred Russel Wallace | Nature / The Alfred Russel Wallace Page | 1870]
 Wallace replies to Alfred W. Bennett's objections to natural selection and defends the explanatory power of selection while acknowledging questions about its limits.

170. [https://people.wku.edu/charles.smith/wallace/S176.htm | Alfred Russel Wallace | Nature / The Alfred Russel Wallace Page | 1870]
 "The Difficulties of Natural Selection" considers criticism of adaptive explanations and demonstrates how Wallace distinguished genuine problems from misunderstandings of selection.

171. [https://people.wku.edu/charles.smith/wallace/S177.htm | Alfred Russel Wallace | Nature / The Alfred Russel Wallace Page | 1870]
 A further contribution to the debate over natural selection shows Wallace refining his arguments about variation, adaptation, mimicry, and evolutionary causation.

172. [https://people.wku.edu/charles.smith/wallace/S139.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1867/1868]
 "A Theory of Birds' Nests" develops Wallace's protective-selection explanation for sexual differences in coloration and became an important component of his dispute with Darwin.

173. [https://people.wku.edu/charles.smith/wallace/S126A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1867]
 Wallace comments on male-female size differences in butterflies, part of the empirical background to his later disagreements with Darwin over sexual selection.

174. [https://people.wku.edu/charles.smith/wallace/S136.htm | Alfred Russel Wallace | Intellectual Observer / The Alfred Russel Wallace Page | 1867]
 "The Philosophy of Birds' Nests" argues that behavior rather than female aesthetic preference can explain some differences in bird coloration, anticipating Wallace's criticism of Darwinian sexual selection.

175. [https://people.wku.edu/charles.smith/wallace/S121.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1866]
 Wallace's paper on reversed sexual characters in butterflies provides early evidence for his developing interpretation of sex differences and selection.

=== Population, Morality, Heredity, and Future Human Evolution ===

176. [https://people.wku.edu/charles.smith/wallace/S558.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1899]
 "The Utility of Specific Characters" revisits Wallace's insistence that evolutionary explanations carefully distinguish adaptive traits from characters whose usefulness remains uncertain.

177. [https://people.wku.edu/charles.smith/wallace/S569AA.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1899]
 "Darwinism and Lamarckism" compares natural selection with inheritance of acquired characteristics and clarifies Wallace's strongly selectionist evolutionary position.

178. [https://people.wku.edu/charles.smith/wallace/S534.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1897]
 "The Problem of Instinct" examines theories of inherited behavior and their relationship to natural selection, intelligence, and learning.

179. [https://people.wku.edu/charles.smith/wallace/S523.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1896]
 Wallace reviews Henry Calderwood's "Evolution and Man's Place in Nature," directly engaging philosophical and scientific interpretations of humanity's evolutionary position.

180. [https://people.wku.edu/charles.smith/wallace/S510.htm | Alfred Russel Wallace | Fortnightly Review / The Alfred Russel Wallace Page | 1895]
 "The Method of Organic Evolution" restates Wallace's understanding of natural selection and competing theories at a time when evolutionary mechanisms were being intensely debated.

181. [https://people.wku.edu/charles.smith/wallace/S497.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1894]
 "Woman and Natural Selection" addresses women's social position and mate choice, themes central to Wallace's proposed alternative to coercive schemes of human breeding.

182. [https://people.wku.edu/charles.smith/wallace/S506.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1894]
 "Why Live a Moral Life?" explores morality, responsibility, future existence, and the foundations of ethical behavior within Wallace's broader conception of human development.

183. [https://people.wku.edu/charles.smith/wallace/S356AA.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1882]
 Wallace discusses poverty and population, illustrating how his evolutionary views became integrated with arguments about economic inequality and social environment.

184. [https://people.wku.edu/charles.smith/wallace/S337A.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1881]
 Wallace discusses the population question, addressing Malthusian ideas that had played an important role in the original development of natural selection.

185. [https://people.wku.edu/charles.smith/wallace/S337B.htm | Alfred Russel Wallace | The Alfred Russel Wallace Page | 1881]
 "The Population and the Land Questions" links demographic pressure with social institutions and shows Wallace resisting attempts to treat poverty as merely a biological consequence.

=== Modern Historical and Scientific Scholarship ===

186. [https://darwin-online.org.uk/people/2020%2C%20John%20van%20Wyhe%2C%20A.R.%20Wallace%20in%20the%20light%20of%20historical%20method.pdf | John van Wyhe | Darwin Online | 2020]
 Van Wyhe applies historical methodology to claims about Wallace's life and evolutionary work, emphasizing the importance of primary evidence when reconstructing his relationship with Darwin and the development of his ideas.

187. [https://academic.oup.com/jhmas/article-abstract/70/1/74/750577 | Michael A. Flannery | Journal of the History of Medicine and Allied Sciences | 2015]
 "Alfred Russel Wallace's Medical Libertarianism" connects Wallace's ideas about human progress, social reform, eugenics, medicine, and evolutionary purpose.

188. [https://www.sciencedirect.com/science/article/abs/pii/S1369848614000119 | Benjamin David Mitchell | Studies in History and Philosophy of Biological and Biomedical Sciences | 2014]
 This study of Wallace's defense of spirit photography examines his ideas about perception, evidence, deception, consciousness, and the scientific investigation of purportedly non-material phenomena.

189. [https://pmc.ncbi.nlm.nih.gov/articles/PMC3321934/ | Thomas P. Weber | Emerging Infectious Diseases | 2010]
 "Alfred Russel Wallace and the Antivaccination Movement in Victorian England" examines how Wallace's social philosophy and statistical reasoning shaped one controversial aspect of his later thought.

190. [https://academic.oup.com/book/51208/chapter/422158972 | Gregory Claeys | Natural Selection and Beyond / Oxford University Press | 2008]
 "Wallace and Owenism" investigates the influence of Robert Owen's reformist philosophy on Wallace's understanding of society, human character, environment, and progress.

191. [https://academic.oup.com/book/51208/chapter/422158977 | Diane B. Paul | Natural Selection and Beyond / Oxford University Press | 2008]
 "Wallace, Women, and Eugenics" analyzes Wallace's views on sex equality, mate choice, heredity, human improvement, and his opposition to coercive eugenics.

192. [https://academic.oup.com/book/51208/chapter/422158982 | David A. Stack | Natural Selection and Beyond / Oxford University Press | 2008]
 Stack examines Wallace's land-nationalization movement and shows how evolutionary ideas, environmental influences, justice, and social reform became integrated in his conception of human progress.

193. [https://academic.oup.com/book/51208/chapter-abstract/422158987 | Martin Fichman | Natural Selection and Beyond / Oxford University Press | 2008]
 "The Cultural Context, 1870–1907" places Wallace's later evolutionary, spiritualist, and social ideas within the intellectual environment of late Victorian Britain.

194. [https://academic.oup.com/book/51208/chapter/422158992 | Steven J. Dick | Natural Selection and Beyond / Oxford University Press | 2008]
 "The Universe and Alfred Russel Wallace" examines Wallace's cosmic arguments and his belief that the emergence of intelligent humanity had wider significance in the history of the universe.

195. [https://academic.oup.com/book/51208/chapter/422158997 | Charles H. Smith | Natural Selection and Beyond / Oxford University Press | 2008]
 "Wallace's Unfinished Business" considers unresolved aspects of Wallace's evolutionary worldview, including humanity's exceptional qualities and his interpretation of progressive evolution.

196. [https://academic.oup.com/book/51208/chapter/422159002 | James Moore | Natural Selection and Beyond / Oxford University Press | 2008]
 "Wallace in Wonderland" reassesses Wallace's intellectual world and the historical relationship among natural selection, metaphysics, human development, and Victorian culture.

197. [https://academic.oup.com/book/51208/chapter/422159007 | Ted Benton | Natural Selection and Beyond / Oxford University Press | 2008]
 "Wallace's Dilemmas: The Laws of Nature and the Human Spirit" analyzes the tension Wallace perceived between evolutionary natural law and the distinctive intellectual and moral faculties of humans.

198. [https://www.cambridge.org/core/journals/british-journal-for-the-history-of-science/article/abs/scientific-naturalism-and-social-reform-in-the-thought-of-alfred-russel-wallace/D6FA2E8F31AA0BA65B642B088A29BBEB | John R. Durant | British Journal for the History of Science | 1979]
 "Scientific Naturalism and Social Reform in the Thought of Alfred Russel Wallace" examines how Wallace connected evolutionary science with radical political and social reform.

199. [https://www.cambridge.org/core/journals/british-journal-for-the-history-of-science/article/abs/alfred-russel-wallace-philosophy-of-nature-and-man/7C49E7B57E69AAB4AE303267AC2CD2A3 | Roger Smith | British Journal for the History of Science | 1972]
 "Alfred Russel Wallace: Philosophy of Nature and Man" analyzes the relationship between Wallace's biological theories, conception of humanity, spiritualism, and philosophy of nature.

200. [https://darwin-editorial.darwinproject.ac.uk/view/letters/DCP-LETT-7460 | Alfred Russel Wallace | Darwin Correspondence Project | 27 January 1871]
 Writing to Darwin about "The Descent of Man," Wallace says he remains unconvinced on important aspects of sexual selection and does not think Darwin has explained every stage of human development through established natural laws.