which predispose to crime, or that, where incapacity is obvious and can be defined, special steps shall be taken not to expose such a person without care or oversight to the conditions of free life, which are likely to be not only ruinous to himself, but dangerous to the community. It is satisfactory to note that incidentally to its general purpose, the inquiry (1) confirms the idea to which practical effect has been given in recent years by the institution of the Borstal system that the effective way of dealing with crime is to attack those between the ages of 16 and 21, which is shown to be the probable age for enlistment in the criminal brigade, (2) it demonstrates by statistical method that imprisonment does not have the adverse physical and mental results which are often alleged, (3) it confirms the opinion held of the necessity for better care being needed for the mental defective, and (4) it shows that it is by consideration of the individual men and women who make up the criminal population that the best solution of the criminal problem is to be found. Those who agree with the opinion of Dr. Goring that the principal determinant in crime is mental deficiency will be encouraged by the passing of the Mental Deficiency Act, 1913, in the belief that this important measure constitutes a great step forward in the rational and scientific treatment of the criminal problem. However much opinion may differ as to the exact proportion borne by heredity and environment, respectively, in the formation of the criminal character, whether any or no predominant part can be ascribed, as by Dr. Goring, to mental defectiveness, the fact remains and is known to all those concerned in the administration of prisons and in the actual treatment of crime, that a considerable number of adult persons in custody cannot be regarded as fully capable of dealing with the ordinary affairs of life. The provision, therefore, that has now been made for the detection and diagnosis of all forms of mental defectiveness from childhood and early youth justifies a general hope and belief that if this Act is effectively administered, a great impression will, in course of time, be made on the figures of imprisonment; and this hope can be held not only by those who take an extreme view of the influence of heredity, but by plain men and women, without scientific training or knowledge, who are now profoundly moved at the sight of persons of both sexes and of all ages coming to prison in the expiation of offences which, had they been mentally conscious of their obligations to society, or adaptable to their social environment and standard of living, they never would have committed. CHAPTER XVII. A SHORT SKETCH OF THE MOVEMENT OF CRIME-- (A) 1872 to 1914: (B) THE WAR, 1914 to 1918.