and not part of a life-long study, the information here presented will be of special value. There are, it is true, many technical works on mental diseases in their medical, social and legal relations, but it is doubtful whether elsewhere there can be found in a single volume as much varied information as that which Dr. May has brought together. There is probably no group of diseases about which there is such widespread popular ignorance or misinformation as those that affect the mind. People who would be ashamed not to have accurate information regarding the more important infectious diseases and more than general knowledge of the means by which they are transmitted speak of "insanity" as if there were a single disorder to which that name could properly be applied, and are without the slightest knowledge of the different forms of mental diseases, the periods of life in which they appear, their main characteristics and the means by which they terminate. Statistics relating even to those persons with mental disorders who are cared for in special institutions are usually quite unfamiliar to persons who have more than an ordinary amount of information regarding the prevalence of other diseases. Such a book as this will go far toward supplying the extraordinary lack of knowledge of conditions that have exceedingly important social and economic relations and from the study of which many lessons can be drawn that are applicable to human affairs far removed from those relating to patients in our hospitals for the insane. THOMAS W. SALMON. Larchmont, New York, January 11, 1922. CONTENTS PART I. GENERAL CONSIDERATIONS. CHAPTER PAGE I. THE SOCIAL AND ECONOMIC IMPORTANCE OF MENTAL DISEASES 15 II. THE EVOLUTION OF THE MODERN HOSPITAL 34 III. LEGISLATION AND METHODS OF ADMINISTRATION 50 IV. THE STATE HOSPITALS—THEIR ORGANIZATION AND FUNCTIONS 68 V. THE HOSPITAL TREATMENT OF MENTAL DISEASES 84 VI. THE DEVELOPMENT OF THE PSYCHOPATHIC HOSPITAL 104 VII. THE MENTAL HYGIENE MOVEMENT 121 VIII. THE ETIOLOGY OF MENTAL DISEASES 138 IX. IMMIGRATION AND MENTAL DISEASES 155 X. MENTAL DISEASES AND CRIMINAL RESPONSIBILITY 169 XI. THE PSYCHIATRY OF THE WAR 185 XII. ENDOCRINOLOGY AND PSYCHIATRY 202 XIII. THE MODERN PROGRESS OF PSYCHIATRY 217 XIV. THE CLASSIFICATION OF MENTAL DISEASES 234 PART II. THE PSYCHOSES I. THE TRAUMATIC PSYCHOSES 253 II. THE SENILE PSYCHOSES 266 III. THE PSYCHOSES WITH CEREBRAL ARTERIOSCLEROSIS 280