Broca, who, by initiating the Anthropological Society of Paris in 1859, has been regarded as the founder of the modern science of anthropology, gave attention also to the special science of criminal anthropology by noting the peculiarities of the skulls and brains of criminals. At the Exeter meeting of the British Association in 1869, Dr. G. Wilson read a paper on “The Moral Imbecility of Habitual Criminals as exemplified by cranial measurements.” He had measured 464 heads of criminals, and found that habitual thieves presented well-marked signs of insufficient cranial development, specially anteriorly. “The cranial deficiency,” he observed, “is associated with real physical deterioration. Forty per cent. of all the convicts are invalids, more or less; and that percentage is largely increased in the professional thief class.” He argued that a prisoner must be treated on reforming principles, and not allowed unrestricted liberty until there was reasonable evidence to show that he would not prove dangerous to society. About the same time, also (in 1870), J. Bruce Thomson, Resident-Surgeon to the General Prison for Scotland at Perth, published in the _Journal of Mental Science_ a summary of his observations on over 5000 prisoners. From the decisiveness of his utterances and the large number of prisoners of whom he was able to speak, this summary gave a stimulus to the study of the criminal throughout Europe. Thomson enumerated some of the physical characteristics of the instinctive criminal now generally recognised, pointed out the semi-imbecility prevalent among the juvenile criminals under his observation, the frequency of accumulated morbid appearances at _post-mortem_ examinations, and the large proportion of cases at Perth needing treatment for mental diseases soon after admission, “apparently from congenital causes.” Thomson’s facts and opinions were too curtly, and, probably, too emphatically stated. Dr. Nicolson, writing also in the same journal from 1873 to 1875, dealt with the morbid psychology of the criminal, the unstable, emotional element in him, his proneness to delusions, his insensibility, and his weak-mindedness. Dr. Nicolson’s papers, all written before the latest and most fruitful era of criminal anthropology began, were, so far as I have been able to trace, the latest original contributions from the scientific side made in England to the study of the criminal. Such knowledge as has been furnished since has come from writers who have, almost of necessity, dealt with what may be called the mental and social symptomatology of criminals. Among the books which supply more or less valuable or interesting information of this kind may be mentioned the Rev. J. W. Horsley’s _Jottings from Jail_, Michael Davitt’s _Leaves from a Prison Diary_, and the _Scenes from a Silent World_, by a Prison Visitor, which appeared in _Blackwood’s Magazine_ during 1889. An earlier book of this class, Mayhew’s _London Labour and the London Poor_ (vol.