An understanding of enzymes and their actions is a prerequisite for any scientific worker who wishes to keep abreast of developments in the biologic sciences. Tauber's book provides a clearly presented but not comprehensive introduction to the present status of enzyme chemistry. Specific examples of each enzyme system are given. Particular care seems to have been exercised in selecting only the actually significant newer references for inclusion in the bibliography. As our knowledge of the fundamentals of biologic processes increases, elucidation of the role of enzymes in the body economy becomes progressively more important. Enzymes play a basic part even in such fundamental cellular units as the chromosomes. Enzyme chemistry, therefore, deserves the serious attention of physicians. This book will provide much of the necessary information.