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In page Thomas Henry Huxley:

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From 1860 to 1863 Huxley developed his ideas, presenting them in lectures to working men, students and the general public, followed by publication. Also in 1862 a series of talks to working men was printed lecture by lecture as pamphlets, later bound up as a little green book; the first copies went on sale in December.[2] Other lectures grew into Huxley's most famous work Evidence as to Man's place in Nature (1863) where he addressed the key issues long before Charles Darwin published his Descent of Man in 1871.[citation needed]