The author of this volume is also the author of a seven-volume series called "Studies of the Psychology of Sex." His extensive work is more particularly suited to the use of physicians, psychologists, and those whose professional lives are greatly concerned with the problems considered. The present volume is more nearly a manual for the general student. It sets forth the view of the author that there is no sharp boundary line between normal and abnormal in sex matters. It provides a concise consideration of such topics as sexual deviations, homosexuality, marriage, the art of love, and the dynamic nature of the sex impulse. For the general reader the book is an adequate presentation of the Havelock Ellis views. It makes clear many subjects which have formerly been considered well concerned in mystery. There is an inefficient glossary and a fairly good index.