Sixteen years ago, when the first French edition of this Manual was published, the author felt it incumbent on himself to offer a sort of apology for following Kraepelin's classification of mental disorders. Since then this classification has supplanted all others throughout the world, so that to-day an apology seems no longer necessary. We have, however, changed the arrangement of the clinical groups, placing them in an order as far as possible according to etiology.

I. Constitutional Disorders

Arrests of development. Epilepsy.

Constitutional psychopathic states. Dementia praecox. Paranoia.

Manic-depressive psychoses. Involutional melancholia. Psychoneuroses. Huntington's chorea.

II. Alcoholic disorders

Pathological drunkenness. Delirium tremens. Acute hallucinosis. Alcoholic delusional states. The polyneuritic psychosis. Alcoholic dementia.

III. Drug Addictions

Opium, morphine, heroin, cocaine.

IV. Syphilitic Disorders

Cerebral syphilis. General paralysis. Cerebral arteriosclerosis.

V. Traumatic Disorders

Traumatic delirium. Traumatic constitution. Traumatic epilepsy. Traumatic dementia.

VI. Miscellaneous Groups

Infective, exhaustive, autotoxic, thyrogenic, organic, and senile psychoses.

To secure uniformity in clinical work and published reports of all institutions in the United States and Canada the American Medico-Psychological Association adopted in May, 1917, a classification of mental diseases with the recommendation that all members introduce it in their respective hospitals. This classification has already been made the official one in many states and it is important for every psychiatrist to familiarize himself with it thoroughly. We have therefore reprinted it in Appendix VIII together with definitions and explanatory notes prepared by Dr. George H. Kirby, a member of the committee on statistics.