
Contents
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The Notebooks The Notebooks
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Darwin’s Pre-Origin Correspondence Darwin’s Pre-Origin Correspondence
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Darwin’s Published Comments On Species Before the Origin Darwin’s Published Comments On Species Before the Origin
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On the Origin of Species, on Species On the Origin of Species, on Species
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After the Origin After the Origin
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Moritz Wagner, Pierre Trémaux, and Geographic Speciation Moritz Wagner, Pierre Trémaux, and Geographic Speciation
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Wallace’s and Weismann’s Adaptationist Definition Wallace’s and Weismann’s Adaptationist Definition
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Cite
Abstract
Charles Darwin's On the Origin of Species discusses why species evolve to be distinct from parental forms, and how they have done so. Darwin's definition of species is simply that they do not interbreed or, in the case of “unisexual” organisms, that natural selection keeps them isolated in the “proper type” suited to the conditions of life in which they live. This chapter presents an extensive and chronological series of quotations from Darwin's published works, including his correspondence and the Notebooks. It also discusses Darwin's contemporaries and their ideas on the concept of species. Alfred Russell Wallace insists that natural selection is the agent of speciation and that species are to be identified with their special adaptations. August Weismann treats species entirely as complexes of adaptations and defends natural selection as the entirety of evolutionary mechanism.
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