The story told in this book begins in about 1700, when the first attempts were made to study the diseased heart in life (the subject matter of cardiology), as distinct from its appearance after death; it ends, rather arbitrarily, in 1970. The account of the development of knowledge of heart disease is mainly chronological with emphasis on the fruitful consequences of the cross-fertilization of clinical practice with pathological anatomy at the beginning of the nineteenth century and with physiology at the end. In addition, shorter chapters deals with such topics as specific disease entities, methods of investigation, cardiac surgery and the work of two individuals - Peter Latham, an example of a physician practising with today's clinical skills but a very imperfect knowledge of the pathogenesis of heart disease and Etienne Marey, an early exponent of the clinical physiology which would, in time, throw light on that pathogenesis.