R. Sommer. Familienforschung. Vererbungs- und Rassenlehre. III. Auflage mit 54 Abbildungen. VII+519, Leipzig, 1927, Preis brosch. RM, 30

A remarkable book by the Gießen professor of psychiatry R. Sommer on the study of families and the doctrine of heredity and race consists of two main parts. It would be worthwhile to dwell on each of the above chapters in more or less detail, since everywhere in the book there are new ideas and original views which every physician who follows the development of the medical sciences and related fields should become acquainted with, losing himself, after all, in such questions as the migration of peoples and the mixing of races. This, however, would mean stretching a book review to several dozen pages. It is therefore necessary to be satisfied with brief indications of the most important things in S.'s book, which cannot be passed over without mentioning them, even in a brief review. This includes, first of all, the author's doctrine of epimixis.