IN A REVIEW covering a three and one-half year period one cannot completely appraise all the interesting and significant papers which have appeared since December 1943. A detailed report of the investigations in the field of cardiovascular disease during this interval would comprise an extensive volume. It has therefore been necessary, in order to achieve reasonable brevity, to stress only those aspects of the subject which represent the most original contributions to the field and which in our opinion hold the greatest promise for the future.
ANATOMIC AND PHYSIOLOGIC ASPECTS
The traditional concepts of the structure and functions of the conducting tissues of the heart have recently been subjected to a critical review by the Glomsets and Birge.1 Being unable to convince themselves of the existence of a special muscular conducting bundle in the dog or in man, they surveyed the literature to see if the experience of