This publication presents the present knowledge of vitamins in a complete and detailed manner. Contributions concerning vitamins in the literature of all countries have been carefully reviewed, and the entire material has been collected and presented in concise form. The numerous experimental studies which have gradually developed the modern conception of vitamins are carefully recorded. Each of the known vitamins is discussed in a separate chapter, which includes clinical observations as well as basic scientific data. The relation of vitamins to dental tissues is considered in detail. The chapter on human diets consists of a discussion of many foods and diets in various countries from the standpoint of their vitamin content. The vitamin requirements of mother and infant are especially stressed. There is included a long list of foods with tables showing their relative content of each of the vitamins.