In the “General Summary and Conclusions” of The Descent of Man, and Selection in Relation to Sex, Charles Darwin argues that man is not the work of a separate act of creation.  Rather, he believes that humans evolved from a lower being to what we are today.  Darwin looks at the “whole organic world”  when finding evidence to support his argument, using the evolution of plants and animals to illustrate his points.  Darwin claims that natural selection and sexual selection are two modes of evolution and explains both in detail.  However, Darwin does not just cover science; he also looks at how social behavior affects evolution and sexual selection.  In this way, non-epistemic values have a great influence on Darwin’s theories.

Darwin’s main argument is that “man is descended from some less highly organized form”. As evidence for his claim, Darwin looks at the similarity between the features of humans and other animals during embryonic development.  He finds that there are “innumerable points of structure and constitution”  that are similar.  Anyone who disagrees with him would be forced to conclude, “man is the co-descendent with other mammals of a common progenitor”.  

He also explains the differences between natural selection and sexual selection, as well as how sexual selection is important to evolution.  First, natural selection depends on how well an organism can adapt to its environment.  If it doesn’t have the means to survive in its environment, then eventually that species will die out and the species able to adapt will survive.  In contrast, sexual selection was first used to explain how particular physical features of certain animals came about, when they appeared to have no practical function.  Darwin realized that those features were probably there to attract the opposite sex for mating since many of them only appeared once the animal had reached maturity and only during mating season.  As organisms become more complex, more factors need to be considered in choosing a mate.  For humans, wealth, rank, and mental qualities come into consideration.  He also warns that humans should refrain from choosing someone with mental or physical inferiorities. Even though humans are at the “very summit of the organic scale,”  humans can further improve their condition through the struggle for existence.

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 Darwin’s ideas deal not only with science and animals, but also with the social and mental conditions of humans.  It is on this topic that the influence of Victorian culture and values is most evident.  First, Darwin tries to explain how humans gained intellect and morality through evolution. He believes that all creatures are “capable of advancement”  but humans have developed higher intellectual and moral qualities through natural selection.  Our intellect has advanced through the improvement of language, since language has allowed humans to form more complete thoughts and improve all of our mental faculties. Our moral qualities have developed ...

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