At the last International Medical Congress held in London, Mr Gladstone made the memorable remark that “Doctors are the future leaders of nations.” This saying, however, by no means applies to therapeutists, but to biologists. Modern biology has revealed fresh methods of knowledge, and given new directions to all sociological studies. The psychology of the future will be an applied science of cerebral anatomy and physiology. And so with criminal psychology, for it is the most natural course to start primarily in the study of the science of crime, and in the science of its prevention, from the criminal act itself, which is no other than a manifestation of the psychology of the criminal. And to study the innate qualities of the criminal, his education, the biographical details of his life—education in the widest sense)—that is the train of thought of the criminal anthropological school.