scholarly journals Darwin's Use of Intellectual Disability in The Descent of Man

2008 ◽  
Vol 28 (2) ◽  
Author(s):  
Steven A. Gelb
Keyword(s):  
Intellectual Disability ◽  
Natural Selection ◽  
Intellectual Disabilities ◽  
Human Evolution ◽  
Mental State ◽  
Charles Darwin ◽  
Human Beings ◽  
Theory Of Evolution ◽  
Descent Of Man

When Charles Darwin turned his attention to writing about human descent in 1871 he attempted to narrow the fossil gap between human beings and higher primates by presenting persons with intellectual disabilities — "idiots" in the language of the day — as evidence in support of the theory of evolution. This paper explores the four ways that Darwin used persons with intellectual disabilities in The Descent of Man: 1) as intermediate rung on the evolutionary ladder connecting humans and primates; 2) as exemplars of the inevitable waste and loss produced by natural selection acting upon variability; 3) as the floor of a scale representing the "lowest", most unfit variety of any species when individuals were rank ordered by intelligence; and 4) as atavistic reversions to extinct forms whose study would reveal the characteristics of earlier stages of human evolution. Darwin's strategic use of intellectual disability is brought to bear on the controversy regarding the mental state of Darwin's last child.

scholarly journals Evolution by Sexual Selection

2021 ◽  
Vol 9 ◽  
Author(s):  
Marion Petrie
Keyword(s):  
Sexual Selection ◽  
Natural Selection ◽  
Charles Darwin ◽  
Female Preference ◽  
Rapid Adaptation ◽  
Theory Of Evolution ◽  
Distinct Process ◽  
Long Time ◽  
Evolution By Natural Selection ◽  
Descent Of Man

Charles Darwin published his second book “Sexual selection and the descent of man” in 1871 150 years ago, to try to explain, amongst other things, the evolution of the peacock’s train, something that he famously thought was problematic for his theory of evolution by natural selection. He proposed that the peacock’s train had evolved because females preferred to mate with males with more elaborate trains. This idea was very controversial at the time and it wasn’t until 1991 that a manuscript testing Darwin’s hypothesis was published. The idea that a character could arise as a result of a female preference is still controversial. Some argue that there is no need to distinguish sexual from natural selection and that natural selection can adequately explain the evolution of extravagant characteristics that are characteristic of sexually selected species. Here, I outline the reasons why I think that this is not the case and that Darwin was right to distinguish sexual selection as a distinct process. I present a simple verbal and mathematical model to expound the view that sexual selection is profoundly different from natural selection because, uniquely, it can simultaneously promote and maintain the genetic variation which fuels evolutionary change. Viewed in this way, sexual selection can help resolve other evolutionary conundrums, such as the evolution of sexual reproduction, that are characterised by having impossibly large costs and no obvious immediate benefits and which have baffled evolutionary biologists for a very long time. If sexual selection does indeed facilitate rapid adaptation to a changing environment as I have outlined, then it is very important that we understand the fundamentals of adaptive mate choice and guard against any disruption to this natural process.

Darwinian Evolutionary Theory

2018 ◽  
Author(s):  
Michael Ruse
Keyword(s):  
Sexual Selection ◽  
Natural Selection ◽  
Middle Class ◽  
Evolutionary Theory ◽  
Scientific Community ◽  
Homo Sapiens ◽  
Origin Of Species ◽  
Theory Of Evolution ◽  
Descent Of Man

Charles Robert Darwin, the English naturalist, published On the Origin of Species in 1859 and the follow-up work The Descent of Man in 1871. In these works, he argued for his theory of evolution through natural selection, applying it to all organisms, living and dead, including our own species, Homo sapiens. Although controversial from the start, Darwin’s thinking was deeply embedded in the culture of his day, that of a middle-class Englishman. Evolution as such was an immediate success in scientific circles, but although the mechanism of selection had supporters in the scientific community (especially among those working with fast-breeding organisms), its real success was in the popular domain. Natural selection, and particularly the side mechanism of sexual selection, were known to all and popular themes in fiction and elsewhere.

Fatal asymmetries

2021 ◽  
pp. 1-15
Author(s):  
Luis Sánchez
Keyword(s):  
Natural Selection ◽  
Artificial Selection ◽  
Political Institutions ◽  
Charles Darwin ◽  
The Impact ◽  
Descent Of Man

Abstract In Descent of Man, Charles Darwin noted the impact of political institutions on natural selection. He thought that institutions such as asylums or hospitals may deter natural selection; however, he did not reach a decisive answer. Questions remain as to whether the selective impacts of political institutions, which in Darwin’s terms may be referred to as “artificial selection,” are compatible with natural selection, and if so, to what extent. This essay argues that currently there appears to be an essential mismatch between nature and political institutions. Unfitted institutions put exogenous and disproportionate pressures on living beings. This creates consequences for what is postulated as the condition of basic equivalence, which allows species and individuals to enjoy similar chances of survival under natural circumstances. Thus, contrary to Darwin’s expectations, it is sustained that assumed natural selection is not discouraged but becomes exacerbated by political institutions. In such conditions, selection becomes primarily artificial and perhaps mainly political, with consequences for species’ evolutionary future.

2. Evolution and natural selection

2019 ◽  
pp. 9-26
Author(s):  
Samir Okasha
Keyword(s):  
Natural Selection ◽  
Charles Darwin ◽  
Natural World ◽  
Early 20Th Century ◽  
Philosophical Argument ◽  
Modern Biology ◽  
Theory Of Evolution ◽  
Philosophical Significance ◽  
Argument From Design ◽  
Evolution By Natural Selection

In 1859 Charles Darwin published On the Origin of Species, in which he set out his theory of evolution. The book marked a turning point in our understanding of the natural world and revolutionized biology. ‘Evolution and natural selection’ outlines the theory of evolution by natural selection, explaining its unique status in biology and its philosophical significance. It considers how Darwin’s theory undermined the ‘argument from design’, a traditional philosophical argument for the existence of God; how the integration of Darwin’s theory with genetics, in the early 20th century, gave rise to neo-Darwinism; and why, despite evolutionary theory being a mainstay of modern biology, in society at large there is a marked reluctance to believe in evolution.

Darwinism

2014 ◽  
Author(s):  
Michael Ruse
Keyword(s):  
Natural Selection ◽  
Land Tenure ◽  
Charles Darwin ◽  
General Term ◽  
Evolutionary Change ◽  
Social Darwinism ◽  
Theory Of Evolution ◽  
Mendelian Genetics ◽  
Thomas Henry Huxley ◽  
Foundational Work

The modern usage of the term Darwinism dates from the publication of On the Origin of Species, by Charles Darwin, in which he argued for evolution through natural selection. Very soon after the appearance of the Origin (in 1859), Darwin’s great supporter Thomas Henry Huxley introduced the term Darwinism. The term—together with the related terms Darwinian and Darwinist—took root. The codiscoverer of natural selection, Alfred Russel Wallace, used the term as the title of a book expounding evolution: Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its Applications. Note that there seems to be a fuzziness about the term. Some identify Darwinism with evolution through natural selection. Others suggest that the essence of Darwinism is not selection per se but change or variation. Late in the 19th century, George Romanes coined the term neo-Darwinism to cover those for whom natural selection is basically the only significant cause of change. In 1930 Ronald A. Fisher, in his Genetical Theory of Natural Selection, argued that the newly developed theory of Mendelian genetics offered the required foundation for a perspective that made natural selection the central force of evolutionary change. Although the British were happy to call the Darwin-Mendel synthesis neo-Darwinism, in America the synthesis was known as the synthetic theory of evolution. This reflects that in the New World it was Sewall Wright who did the foundational work in bringing Mendelian genetics into the evolutionary picture and that he never thought of natural selection as being the force that Fisher took it to be. For Wright and his followers, especially Theodosius Dobzhansky, genetic drift was always a major component of the evolutionary picture, and as Fisher pointed out nonstop, this is about as non-Darwinian a notion as it is possible to have. By 1959 professional evolutionists (on both sides of the Atlantic) agreed that Darwin had been right about natural selection: it is the major cause of evolutionary change. Neo-Darwinism fell into disuse, as everyone now used the term Darwinism for evolution through natural selection. Mention should also be made of so-called social Darwinism, the application of Darwinism to persons and groups within society. The earliest use apparently was during Darwin’s own lifetime, by a historian discussing land tenure in Ireland. However, it was not a popular or general term, coming into widespread use only in the 1940s, with the publication of the American historian Richard Hofstadter’s book Social Darwinism in American Thought.

Darwin, Teleology and Taxonomy

Philosophy ◽  
1973 ◽  
Vol 48 (183) ◽  
pp. 35-49 ◽  
Author(s):  
Andrew Woodfield
Keyword(s):  
Natural Selection ◽  
Philosophy Of Science ◽  
The Sun ◽  
Origin Of Species ◽  
Theory Of Evolution ◽  
Language User ◽  
The Subject ◽  
Evolution By Natural Selection ◽  
Descent Of Man

Darwinism is ‘much more than a theory’, said the German botanist Albert Wigand in 1875; ‘it is a frame of mind which dominates thought, a resuscitated “Naturphilosophie”, in which the terms “Polarity”, “Totality”, “Subject”, “Object” are replaced by terms such as “Struggle for Existence”, “Inheritance”, “Selection”, and so on.’ Subsequent events have indicated that Wigand had a point. But it is not clear to us yet what exactly the point is. Interest in Man's Place in Nature, and in his alleged biological uniqueness as a language-user and tool-maker, is as great now as it was in 1871 when Darwin's Descent of Man was first published. We now have access to well over a hundred years' worth of material sparked off by The Origin of Species, linking Darwin's theory of evolution by natural selection to almost every field under the sun. Yet the precise status of his theory is still the subject of vigorous controversy in philosophy of science.

Joseph Dalton Hooker, F. R. S. (1817-1911)

1959 ◽  
Vol 14 (1) ◽  
pp. 109-120
Keyword(s):  
Natural Selection ◽  
Major Part ◽  
Charles Darwin ◽  
Plant Taxonomy ◽  
Theory Of Evolution ◽  
General Acceptance ◽  
Long Period ◽  
Varying Length ◽  
Joseph Dalton Hooker ◽  
Living Material

Joseph Dalton Hooker was eight years the junior of Charles Darwin (1809-82) and lived twenty-nine years after Darwin’s death. He was, for a long period, the personal friend of Darwin and the frank critic of many of Darwin’s researches and of the botanical aspects of Darwinian theories. Hooker was a botanist and, since he had an extensive first-hand experience of many branches of botany, above all of plant taxonomy and phytogeography, it was naturally the botanical aspects of evolutionary problems which both interested him and concerning which he was best able to help Darwin. Such help was gratefully and fully acknowledged by Darwin, as is shown by published correspondence. Numerous letters passed between Darwin and Hooker and the latter visited his friend at Down and stayed there for periods of varying length. A considerable amount of living material was obviously supplied from Kew for the later botanical experiments Darwin carried out at Down. The assistance given by Hooker in the accumulation of facts and in criticism of theories preparatory to the publication of the Origin of species and later works of Darwin, his presenting (with Lyell) and reading Darwin’s communication to the Linnean Society of London on 1 July 1858 introducing the theory of natural selection, and his influence in gaining the speedy general acceptance of the theory of evolution are well known and it is not necessary to consider them here in much detail. It is proposed, instead, to outline very briefly the salient facts in the life of J.D. Hooker and then to devote the major part of this essay to a consideration of the development of his views on the problems of species, phytogeography, and evolution. In part at least, this means considering the influence of Darwin on Hooker but, from a wider viewpoint, it is possible to form some conception of the clarifying and unifying effects of the acceptance of the general theory of evolution on biological thought.

The Loss of Rational Design

2005 ◽  
Vol 56 ◽  
pp. 235-257
Author(s):  
Friedel Weinert
Keyword(s):  
Natural Selection ◽  
Rational Design ◽  
Charles Darwin ◽  
British Association ◽  
Human Origins ◽  
Origin Of Species ◽  
Descent Of Man

Charles Darwin published hisOrigin of Specieson November 24, 1859. Whatever hurdle the theory of natural selection faced in its struggle for acceptance, its impact on human self-images was almost immediate. Well before Darwin had the chance of applying the principle of natural selection to human origins—in hisDescent of Man(1871)—his contemporaries quickly and rashly drew the inference to man's descent from the ape. Satirical magazines likePunchdelighted in depicting Darwin with his imposing head on an apish body. At the Oxford meeting of the British Association for the Advancement of Science (June 1860), Bishop Wilberforce asked T. H. Huxley triumphantly whether he traced his ancestry to the ape on his grandfather's or grandmother's side. A wave of evolutionary texts swept over Europe (L. Biichner, E. Haeckel, T. H. Huxley, J. B. Lamarck, C. Lyell, F. Rolle, E. Tyler and K. Vogt). Written in English, French and German, they all had a common focus: the place of humans in a Darwinian world, including religion and morality.

On the Compatibility of Evolutionary Biology and Theism

2020 ◽  
Vol 12 (3) ◽  
pp. 23
Author(s):  
John Lemos
Keyword(s):  
Natural Selection ◽  
20Th Century ◽  
Evolutionary Biology ◽  
Charles Darwin ◽  
Biological Evolution ◽  
Image Of God ◽  
Christian Belief ◽  
Human Beings ◽  
Creation Story ◽  
The Image Of God

Human beings are the products of many thousands of years of biological evolution, and this process occurs in accordance with the principles of natural selection originally articulated and defended by Charles Darwin and developed and defended further in the modern synthesis of the 20th century.  In this paper, I consider how it may be thought that this fact threatens the rationality of belief in the Christian God.  These threats are countenanced with respect to issues of design, randomness, suffering, and the objectivity of ethics.  I argue that while some versions of Christian belief, such as those grounded in a literalist reading of the Genesis creation story or those committed to the image of God thesis, may be threatened by a Darwinian worldview, there are nonetheless plausible versions of Christian belief that are immune to Darwinian challenges.

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