Intensive investigations have created gaps—unavoidable by virtue of their inherent trends—between varied and yet related fields of medical science. In the attempt to bridge one of these gaps, the clinician and the roentgenologist have built up a loose form of cooperation, each borrowing from the knowledge and experience of the other. "Clinical Roentgenology of the Cardiovascular System" offers to the cardiologist everything that its title implies. The author, fundamentally a clinical physiologist and thoroughly conversant with the mechanism of cardiac symptoms and signs, has made a roentgenologic study of the cardiovascular system, with all the fundamentals of normal and pathologic physiology projected into his observations. That is, he has borrowed directly from the specialized branches of medicine and not from the specialist in interpreting them.
Considerable attention is given to the description of correct roentgenologic technic, including orthodiagraphy and kymography. The difficulties encountered and the mathematical considerations involved in the