This extensive monograph on the electrocardiogram represents a significant contribution to the subject. The monograph's strength lies in its handling of theory. The clinical aspects are less satisfactory, and the section on arrhythmias is not so outstanding. The author has taken the opportunity in this monograph to expand the important contributions made by himself and his co-workers to the theory of electrocardiography.
The first section deals with the theory of action potentials; the second, with its application to the actual recording of cardiac events. Use is made of the monophasic curve, of current flow inside and outside the muscle cell, of the depolarization and repolarization processes, and of vector analysis. Also considered is the concept of solid conductors. The remaining sections deal