The author points out in his preface that few books on electrocardiography are truly elementary and easy to read. He has tried to write a book that requires no previous knowledge of basic fundamentals of electrocardiography such as physics and mathematics. To a large extent he has succeeded. The general practitioner who is anxious to know something about the common, everyday cardiac conditions in which electrocardiographic abnormalities are noted will find this book quite helpful. A simple explanation of the electrocardiogram and the reason for taking the various leads is contained in the first chapter. Chapters on rate and rhythm and the various complexes in the electrocardiogram follow. The arrhythmias are well covered, and the illustrations are excellent. Myocardial infarction and coronary artery insufficiency are covered surprisingly well, considering that only 25 pages including the illustrations are allotted to this important subject. The illustrations throughout are clear and well chosen.