The work of the out-patient service includes in a general way the study of cases referred to that department from the wards of the hospital or by its social service staff; cases referred by courts, schools, social agencies, and other institutions, as well as those sent by practicing physicians and individuals coming on their own initiative. The response on the part of the public to the facilities offered by the out-patient department is shown by the fact that 9,273 new cases were reported during a seven-year period, an average of 1,324.7 per year. Fifty-seven and six hundredths per cent of these cases were adults, 17.8 per cent were classified as adolescents, 24.25 per cent as children and .89 per cent as infants. The source of origin of these cases is exceedingly interesting. Four and eighty-seven hundredths per cent were referred to the out-patient service by courts; 4.65 per cent, by schools; 11.77 per cent, by hospitals; 9.77 per cent, by physicians; and 3.55 per cent, by individuals. Fifteen and five tenths per cent came from the wards of the Psychopathic Hospital; 9.96 per cent, from the social service department and 13.3 per cent came on their own initiative. The question as to why these cases are sent to an institution of the psychopathic hospital type can now be answered. Fourteen and fifty-two hundredths per cent were examined solely for the purpose of determining the existence of probable mental diseases and 21.88 per cent on account of suspected mental defects. Four and fifty-two hundredths per cent were sex offenders. In 8.64 per cent the only question at issue was the possibility of a psychoneurosis and in 7.97 per cent the purpose of the examination was to ascertain whether or not syphilis was present. The diagnoses show the nature of the cases encountered in an out-patient mental clinic. Four and eighteen hundredths per cent were cases of dementia praecox; 1.7 per cent of alcoholism; 2.26 per cent of alcoholic psychoses; 2.39 per cent of epilepsy; 15.72 per cent of mental deficiency; 9.0 per cent of psychoneuroses; 2.14 per cent of manic-depressive insanity; 2.09 per cent of psychopathic personality; 1.21 per cent of general paresis; and 2.94 per cent were unclassified. Two and thirty-two hundredths per cent were diagnosed as suffering from syphilis in some form and 6.27 per cent were either delinquent, defective, subnormal, retarded or distinctly feebleminded. In 3.76 per cent no disease was found, either mental or physical. The great bulk of these cases were diagnosed either as mental deficiency, psychopathic personality or epilepsy. The ultimate disposition of 2,741 cases, covering a period of two years, serves as an index of the practical operation of such a department. In 42.03 per cent of these cases no care or observation other than that of the out-patient department was required. In 1.69 per cent of the cases commitment was recommended to hospitals for mental diseases, in 7.15 per cent, to schools for the