A pioneering work in psychology, this enormously influential book served as a catalyst in the study of the foundations of social behavior. Ironically, its approach marked such a dramatic departure from contemporary trends that it stimulated little follow-up research at the time of its 1908 publication. In recent years, however, the author's ideas have been resurrected in sociobiological reasoning, making the republication of this systematic treatise particularly timely. McDougall's...