During 3 to 6 May 1964, a course on Chagas' disease was given in the Department of Clinical Therapeutics of the Faculty of Medicine of the Federal University of Minas Gerais, Belo Horizonte, Brazil. This book collects the presentations made in the course into 31 chapters. It has been a pleasure to read it and to review it, because I know (or knew; two are dead) most of the 35 collaborators, and many of them are good friends. Moreover, the book answers in part a question that has puzzled me: why was Brazil so slow to make a national effort toward the control of Chagas' disease, possibly the most important parasitic disease in the country? The answer is found in the initial chapter, by Carlos Chagas Filho, the only surviving son of Carlos Chagas. This is a dispassionate, objective discussion of the history of Chagas' disease in Brazil, from its discovery, in 1909, to 1964.