The classic that exploded into public controversy and revolutionized the course of science in Signet Classic edition. Features include a complete glossary, index, and an Introduction by noted biologist Sir Julian Huxley. In The Origin of Species (1859) Darwin challenged many of the most deeply-held beliefs of the Western world. Arguing for a material, not divine, origin of species, he showed that new species are achieved by "natural selection." The Origin communicates the enthusiasm of original thinking in anopen, descriptive style, and Darwin's emphasis on the value of diversity speaks more strongly now than ever. As well as a stimulating introduction and detailed notes, this edition offers a register of the many writers referred to by Darwin in the text.