The third volume of this series on vitamins and hormones includes contributions from fourteen individuals in England, the United States and Palestine. These research workers report on the interrelation of vitamins, the synthesis of B vitamins by intestinal bacteria, sulfonamides and vitamin deficiencies, manifestations of antepartum nutritional deficiency, growth factors in microbiology, synthetic estrogens, chemistry of anti-pernicious anemia substances of liver, action and metabolism of gonadotropic hormones and the role of acetylcholine in the mechanism of nerve activity. Those who want a monograph on advances in research and applications of vitamins and hormones will find this volume a useful reference source. Of course the advanced worker will obtain greatest value, but any one interested in hormones and vitamins would read this book with profit. It is the type of monograph for which there is much need and of which there should be more in other fields.