Many books on rheumatic fever, congenital heart disease, laboratory diagnosis of heart diseases, and lengthy sections on cardiologic subjects in pediatric textbooks have been written but until now there is no comprehensive textbook in the field of pediatric cardiology. It is fortunate that the first book to appear to fill this real need is an excellent one. Dr. Nadas, of the Children's Medical Center in Boston and Harvard Medical School, is a recognized authority in the field of cardiology and has contributed much to its recent rapid development.