This 1896 volume by Reverend J. A. Zahm, a professor of physics at the University of Notre Dame, considers the Catholic theological tradition as it relates to evolution. The author discusses Darwin's theory of evolution in detail, and traces the debate between theologians and scientists back to the early days of evolutionary theory. He compares late nineteenth-century evolutionary theory and the beliefs of the Catholic church, carefully evaluating the arguments and probing errors and misconceptions in theory and terminology. He also attempts to shed light on the little-understood relations between evolutionism and Christianity as a whole, and discusses whether a person of any Christian denomination can be an evolutionist. Zahm's thoughtful work is considered to be one of the most important volumes on evolution ever written by a Catholic.