More than 150 years after the publication of On the Origin of Species, Darwin's 'dangerous idea' continues to spark impassioned scientific, philosophical and theological debates. This series includes key texts by precursors of Darwin, his supporters and detractors, and the generations that followed him. They reveal how scholars and philosophers approached the evidence in the fossil record and the zoological and botanical data provided by scientific expeditions to distant lands, and how these intellectuals grappled with topics such as the origins of life, the mechanisms that produce variation among life forms, and heredity, as well as the enormous implications of evolutionary theory for the understanding of human identity.