Kraepelin[2] asserts that mental disorders occur ten times as frequently in prison as in freedom. The criminal, who in most instances is already burdened with a more or less strong predisposition to mental disorder, upon being placed in prison finds himself at once in a most favorable environment for a mental breakdown. It is true, imprisonment acts more deleteriously upon the psyche of the criminal by passion, the accidental criminal, but even the recidivist who would be expected to feel less keenly the painful loss of freedom, falls a prey to the deleterious effects of prison life. The unfavorable hygienic surroundings which are found in most prisons, the scarcity of air and exercise, readily prepare the way for a breakdown, even in an habitual criminal. Above all, however, it is the emotional shock and depression which invariably accompany the painful loss of freedom, the loneliness and seclusion, which force the prisoner to a raking occupation with his own mind, to a persistent introspection, making him feel so much more keenly the anxiety and apprehension for the future, the remorse for his deed, that play an important rôle in the production of mental disorders. This is especially true when it concerns an accidental criminal, one who still possesses a high degree of self-respect and honor. Imprisonment furnishes us with a great variety of mental disorders, the origin of which can be traced in a more or less direct manner to the emotional shock and influence upon the psyche which it brings about. The psychogenetic origin of the psychoses of criminals can be established far more clearly in prisoners awaiting trial. Here the deleterious effect of confinement upon the physical health can be ruled out almost entirely, and the etiologic factor must be sought for exclusively in the emotional shock which the commission of the crime and its attending consequences provoke. The strong effect upon the psyche produced by the detection and confinement, the raking hearings and cross-examinations, and the uncertainty and apprehension of the outcome of it all are the factors that are at play here.