Our system of dealing with criminals has not escaped criticism and has not borne it well. Like all systems, it is based largely on the assumption that men are, or ought to be, of one pattern. It is charged with failing to reform those who come under its sway; but there is nothing to show that it was designed for their reformation. Men are brought under it as a punishment; and their acts, not their personality, are the cause of their imprisonment. Experience has shown that the military man who applies impartially a set of rules to those who come under him has not been a success when placed in charge of an institution for dealing with offenders. It is not that he is less human than others, but that he is more rigid. Differences among those placed in his charge have always been recognised; for instance, they could not all be treated as though they were the same height, nor could it be assumed that it was possible to secure uniformity amongst them in this respect; but only the most obvious differences were regarded. Even elementary classifications could not be left to the man whose duty it was to administer rules, and so the doctor's aid was obtained in order to sort out those who were physically unfit to do any but light work; those to whom the diet was unsuited; and those who required to have special privileges granted them lest the system killed them. It is sometimes much easier to call in the doctor than to get rid of him; and largely on account of his work it has been shown that all classifications hitherto made have been inadequate. In the name of science he demands still further classifications. Men can only be placed in classes because of certain qualities they have in common. Every classification must neglect individual differences; and as it is these that mark men off one from another, any system or method of dealing with men will fail in so far as they are left out of account. The treatment of the criminal is not a medical question. It is a social question. A medical training is of more use to a man who is to study the subject than a military training would be. It is important to be able to form a rational opinion on the physical and mental capacity of a man; to know whether he suffers from any disease which impairs his faculties and to be able to direct treatment to the cure of that disease; but a considerable degree of knowledge regarding these things may coexist with an amazing amount of ignorance regarding the social conditions under which the person examined has been brought up and formed. Give the medical man head and, so far as he is merely a medical man, he will be a more expensive nuisance than the military administrator.