Peter J. Bowler's comprehensive, fascinating account of the history of evolutionary theories introduces specialist and nonspecialist alike to one of the most potent scientific ideas of modern times. This new edition is updated in its content and includes an augmented bibliography that offers an unparalleled guide to further reading. As in the original edition, Bowler's even-handed approach not only clarifies the history of his controversial subject but also adds significantly to our understanding of contemporary debates over it. The idea of evolution continues to evolve.