Dr. Thorpe calls this work a text for medical students, but it will be of great interest to physicians who have been unable to keep up with the enormous current output of the biochemists. The book has been almost completely rewritten in order to place in perspective the discovery of the Krebs' tricarboxylic acid cycle, to incorporate new findings about the nature and action of enzymes, the amino acid content of proteins, nutritional requirements of humans, and the chemistry of vitamins and hormones, and to include a chapter on tracer studies. The organization of material is logical, and the writing is good. Naturally, the terminology is British. The printing and binding are also good, but the paper reflects the continuing shortage of rag stocks in England. The index is exceptionally easy to use because of its typography.