This is all; and yet it is sufficient to enable the student of crime to arrive at positive conclusions concerning the measures which society can take in order to defend itself against crime; whilst he can draw other conclusions from criminal statistics. As for the principal data hitherto established by criminal anthropology, whilst we must refer the reader for detailed information to the works of specialists, we may repeat that this new science studies the criminal in his organic and in his psychical constitution, for these are the two inseparable aspects of human existence. A beginning has naturally been made with the organic study of the criminal, both anatomical and physiological, since we must study the organ before the function, and the physical before the moral. This, however, has given rise to a host of misconceptions and one- sided criticisms, which have not yet ceased; for criminal anthropology has been charged, by such as consider only the most conspicuous data with narrowing crime down to the mere result of conformations of the skull or convolutions of the brain. The fact is that purely morphological observations are but preliminary steps to the histological and physiological study of the brain, and of the body as a whole. As for craniology, especially in regard to the two distinct and characteristic types of criminals--<p 8>murderers and thieves, an incontestable inferiority has been noted in the shape of the head, by comparison with normal men, together with a greater frequency of hereditary and pathological departures from the normal type. Similarly an examination of the brains of criminals, whilst it reveals in them an inferiority of form and histological type, gives also, in a great majority of cases, indications of disease which were frequently undetected in their lifetime. Thus M. Dally, who for twenty years past has displayed exceptional acumen in problems of this kind, said that ``all the criminals who had been subjected to autopsy (after execution) gave evidence of cerebral injury.''[3] [3] In a discussion at the Medico-Psychological Society of Paris; ``Proceedings'' for 1881, i. 93, 266, 280, 483. Observations of the physiognomy of criminals, which no one will undervalue who has studied criminals in their lifetime, with adequate knowledge, as well as other physical inquiries, external and internal, have shown the existence of remarkable types, from the greater frequency of the tattooed man to exceptionally abnormal conditions of the frame and the organs, dating from birth, together with many forms of contracted disease.