The subject of this little book is, as its title shows, Cesare Lombroso, the man and the investigator; it makes no attempt to deal adequately with Lombroso, the reformer of criminology and criminal sociology. To do justice to Lombroso's work in the latter respect would be impossible, without at the same time writing the history of the Italian school of "positive criminal jurisprudence" and that of the influence of that school upon important tendencies of the public life of all the leading civilized peoples. It would also be impossible without dealing at the same time with the plan of the new German criminal code. For many reasons I have refrained from any such attempt; above all, in view of limits of space. None the less, I have dealt with Lombroso's activity as a reformer as far as this was essential in order to do justice to the personality of the deceased investigator.