On the Origin of Species presents natural selection theory as a framework for understanding and explaining varieties and species and their generation from common parentage over millennia. However, in 1868, he released part of the longer work, which was published under the title The Variation of Animals and Plants Under Domestication. Wallace sent Darwin a draft of his research on the subject in March 1958, prompting Darwin to focus more intently on writing On the Origin of Species, which he completed the following year. He initially abandoned the larger project because a colleague, Alfred Russell Wallace, independently (but concurrent) developed natural selection theory. Darwin released six updated editions of On the Origin of Species during his lifetime but always considered it merely the popularized “abstract” of a longer work, which he never completed: Natural Selection, a more detailed, scientific account of the basic concepts he presented in On the Origin of Species (which he worried lacked adequate scientific evidence).
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