Like the previous "Annual Reviews of Physiology," this volume for 1944 is very good. The subjects covered are reviewed well. Such a review affords an opportunity for those who cannot follow the work in the physiologic literature to learn the important contributions made in the field. It also makes possible an opportunity for those in physiologic work to observe the data collected from many sources collectively, thus permitting a better evaluation. The complete bibliographies appended to each chapter serve as excellent references. Such a review is of great value to every worker in both the clinical and the preclinical medical sciences. It is recommended highly to all medical students, interns and residents, as well as to practicing physicians, who tend to neglect the problem of applied physiology.