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This edition of Dr. Pardee's book contains revisions and additions which bring the subject matter up to date. It is written in the same clear style which characterized his first edition and which makes it one of the most readable books on the subject in English. If there is any unfavorable criticism, it lies in the author's tendency to be, perhaps, too dogmatic about some of the alterations in the cardiograph curves under pathologic conditions. These assertions are rare, however, and are perhaps warranted on the basis of clarity for the average user of the book. As the author has intimated, the increasing availability of cardiograph records and knowledge concerning them make just such a book as this worth while for the library of any internist or general practitioner.