This is part of the American Lecture Series. It offers information on racial variations in man and contains discussions on physical anthropology, comparative anatomy and physiology, biology, paleontology, cultural anthropology, archeology, history and other facets of this field of knowledge. While there are three authors, the book presumably was read—or at least parts of it—during its preparation by many others who could contribute criticism and suggestions from their own experience. Those who are interested in the development of the races will find this an interesting presentation. The style is conducive to easy reading. The type and paper are pleasing to the eye and the format, in general, commendable.