The major part of this monograph is a practical demonstration of the various abnormalities which occur in the electrocardiogram. Chapters 1 and 2 deal with fundamentals and normal variations. The illustrations are clearly marked and analyzed. No theoretical considerations are attempted and no clinical data given except in the chapter on "T Wave Abnormalities and Coronary Thrombosis." This is a very simplified text and contains the essentials for analysis of an electrocardiogram.