These are the days of superspecialization, and almost every internist wants to be a cardiologist. Cardiology is a clearcut definite subject and one which involves attractive methods of precision, such as electrocardiography. As a result there has literally been a flood of monographs during the past four years on various aspects of heart disease. Dr. Willius uses the case history method to present vividly the outstanding features of cardiac disorders. A case or two each night should make good and useful bedtime reading for the tired practitioner. The volume is attractively got up and is full of excellent photographs and charts.