& Brothers, 49 E. 33d St., New York 16, 1960.
The rapid expansion of physiological knowledge has brought with it a new type of "specialist"—the clinical physiologist. In the cardiac and pulmonary fields great strides have been made by those capable of applying physiological principles and techniques to clinical problems. Proper clinical management demands a deep understanding of physiological principles. Dr. Williams has bravely set out to provide us with an explanation of basic physiologic principles as they apply to heart and lung function, how they become deranged in disease, and also to explain the physiological bases for some of the more common and important symptoms. I say bravely because it is inevitable that the author of such a text will incur the adverse criticism of both physiologist and clinician for what both probably consider a cursory and inadequate approach to the subject. Such criticism is grossly unfair. This is