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The third, revised edition of Maher's book is a distinct improvement over the preceding ones. The detailed criticism of the second edition (J. A. M. A. 109: 1223 (Oct. 9) 1937) has borne fruit in a thorough correction of some errors in the text, particularly in the presentation of the electrocardiograms. In the present edition, the electrocardiograms and their descriptions are on facing pages, an arrangement which simplifies the study of them and eliminates the interruptions in the text. An excellent correlation is achieved by presenting at the start of the book the classification of the Criteria Committee of the New York Heart Association and by rigidly adhering to its nomenclature throughout. The arrhythmias are well presented, as they should be. The chapter "The Electrocardiogram in Coronary Disease" is well done and should give the general reader a modern conception of this controversial subject. The electrocardiograms that illustrate this section