George John Romanes (1848–94) was an influential evolutionary biologist whose work focused on the evolution of mental faculties. Although criticised for his anecdotal method, he is credited as being one of the pioneers of comparative psychology for his work on animal intelligence, and he also contributed to the development of the theory of natural selection. Romanes and Charles Darwin (1809–82) were close friends, and Darwin gave Romanes his notes on psychology for use in his studies. First published in 1896, this biography was written by his wife Ethel (1856–1927), also an author on religious topics. This reissue is of the second printing (also 1896): including correspondence between Darwin and Romanes, it is a rich source of information on both men and the development of their work. This book is also fascinating for its account of Romanes' mental conflict between his Christian faith and belief in evolution.