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Electrocardiography may be approached from two standpoints. First, there is the use and interpretation of the tracings by the general physician. He must know the elements of electrocardiographic interpretation and be able to recognize the changes of important conditions such as auricular fibrillation or complete heart block. Second, there is the study of the meaning in cardiac physiology of more esoteric changes in the electrocardiogram, and here one enters the field of research and the domain of the expert. While the present work is thoroughly done and deals comprehensively with the subject, its main purpose is still to help and instruct the physician in understanding and interpreting tracings. The general introductory matter, the abundant illustrations and the clinical notes all help in carrying out this purpose, and the book is to be highly recommended as an instructive and readable treatise, comprehensive enough but not going into controversial matters enough to