Hamilton Cravens challenges widespread belief to argue that the influence of evolutionary ideas on American culture and science has been greater since the collapse of Soical Darwinism than before. "Now stands as the most thorough exploration of evolutionary thought in the United States during the period it covers... The book deserves a wide reading." -- Science "A very useful volume. No other work covers the same range of topics and sources." -- Isis Hamilton Cravens is professor of history at Iowa State University at Ames. Science, History, Evolution