In this book the editors have gathered a series of eleven articles on various aspects of diagnosis written by different authors, most of the material having originally appeared in the Practitioner. The subjects have been selected as ones of interest to the general practitioner. Of necessity the discussions are relatively brief and practical. Typical chapters are on the diagnostic importance of the tongue and cardiac murmurs in childhood. The last half of the book is devoted to chapters on laboratory diagnosis, such as laboratory tests in diseases of the liver and gallbladder and the basal metabolic rate. The book is clearly written. A fair number of illustrations and tables are included.