It has been shown that the special field covered by the Boston Psychopathic Hospital consists of temporary care cases. The principal psychoses represented by 12,252 admissions of that class were as follows: alcoholic psychoses, 9.25 per cent; dementia praecox, 25.0 per cent; senile psychoses, 3.16 per cent; general paresis, 6.06 per cent; manic-depressive psychoses, 10.14 per cent; arteriosclerosis, 3.23 per cent; epilepsy, 1.85 per cent; and without psychoses, 20.63 per cent. This latter class (without psychosis) is looked upon by some as constituting the most important field of a psychopathic hospital. It is exceedingly interesting to note the conditions which bring such individuals to the institution. An analysis of 1,430 cases shows the principal mental types represented to be as follows:—mental deficiency, thirty-four per cent; psychopathic personality, 15.17 per cent; hysteria, neurasthenia and other psychoneuroses, 11.2 per cent; epilepsy, 8.04 per cent; alcoholism, 6.08 per cent; conduct disorders, 4.2 per cent; syphilis, 2.03 per cent; organic brain diseases, 1.68 per cent; neurosyphilis, 1.26 per cent; drug addictions, 1.4 per cent; somatic conditions, 1.19 per cent, etc. No less interesting and instructive is a study of the voluntary cases. An analysis of 1,807 admissions of this type shows the following distribution of psychoses: alcoholic psychoses, 5.64 per cent; dementia praecox, 18.43 per cent; manic-depressive, 6.81 per cent; involution melancholia, .99 per cent; senile psychoses, 1.11 per cent; general paresis, 7.9 per cent; epilepsy, 1.05 per cent; psychoneuroses, 3.59 per cent; and without psychosis, 34.64 per cent.