In the first part are discussed electrophysiology and the electrocardiograph. The second part treats of the normal electrocardiogram. The third section deals with the pathologic electrocardiogram. The title of the monograph is a little misleading, for in addition to the electrocardiographic details of the various types of cardiac irregularities the author briefly takes up the etiology, pathology and clinical manifestations. In some chapters, as in the one on auricular fibrillation, these phases of the subject are quite fully considered. There are many excellent and helpful illustrations, most of which are original. While the work contains little that is new, it is to be commended as a compact, well considered, reliable summary of the essentials of electrocardiography.