The case-histories, of which the book contains an abundance, show, indeed, that genuine women criminals are endowed with the same fundamental peculiarities which Lombroso has so fully described in male criminals, and the prostitute is exhibited no more than as a slightly divergent variety of the woman criminal; but the peculiar part which the female sexual life and the endowment of the woman criminal with the attributes of motherhood play in her psychology, give to the general picture of the female criminal certain peculiarities which justify a separate treatment of feminine criminal psychology. This thesis of Lombroso’s, that among women criminals the number of genuinely criminal types is small, whilst the number of occasional criminals is very large, is supported by the following considerations (quoted by him in the book we are now studying). Some years before the publication of “La donna delinquente,” an anthropological investigation undertaken in prisons for women by other authors showed that in women the various characters commonly found in male criminals were less frequently present. Varieties of the skull and of the external ear, abnormalities of dentition, of the growth of the hair, etc., were found only in from 10 to 20 per cent. of female prisoners, as compared with 40 to 60 per cent. of male prisoners, whereas the well-marked “criminal characteristics” are actually more frequently present in prostitutes than they are in male criminals. Another important objection to Lombroso’s views on the nature of the criminal is answered in his work on political crime and revolutions. The very title of this book, “Il delitto politico e le rivoluzioni” (Bocca, Turin), shows that Lombroso, whose investigations had hitherto been concerned with the criminal only, not with crime itself, was now working in a wider field. Although in this book the sections dealing with the individual factors of political crime, and the descriptions of the criminaloid, degenerate, and mentally-disordered protagonists of political disturbance, are the fullest and at the same time the most successful; none the less, Lombroso’s investigations into the historical nature of revolutions and revolts, and his explanation of their etiology, deserve our consideration, and in many cases our admiration. Unquestionably, this is a field of ideas to which a positive mode of treatment is especially applicable; and in this portion of his work Lombroso has utilized with profit and ability, and not seldom with true genius, the method of Buckle and the conceptions of the doctrine of evolution.