Although the incidence of mental as compared with other diseases prevalent in the community cannot be established with absolute accuracy, sufficient evidence has been presented to warrant the statement that from the standpoint of the public health we are dealing with no other problem of equal importance today. The state care of mental defects, epilepsy, tuberculosis and the deaf, dumb and blind is, for various reasons, of much less consequence to the community than the hospital treatment of mental diseases. The defective, delinquent, criminal and dependent classes combined do not equal in number the population housed in our state hospitals for mental diseases. Nor does the number of cases cared for in the general hospitals of the state, county or municipal type compare in any way with the mental cases coming under state or federal supervision. It can, I think, be said without any fear of contradiction that no other disease or group of diseases is of equal importance from a social or economic point of view. Perhaps nothing emphasizes this fact more strongly than the report recently issued from the Surgeon General's office relative to the second examination of the first million recruits drafted in 1917. Twelve per cent of these were rejected on account of nervous or mental diseases. The number disqualified for service finally reached a total of over sixty-seven thousand. Mental integrity is now looked upon as a military necessity and is insisted upon as one of the important requirements of the soldier. It has been demonstrated conclusively that only men of the most stable mental equilibrium can withstand the stress and strain of modern methods of warfare. Nor are peacetime requirements any less exacting. In commercial competition the law of the survival of the fittest is practically absolute. The feebleminded often inherit wealth, but they rarely acquire it. Vaccination for the prevention of smallpox is compulsory and the isolation of communicable diseases dangerous to the public welfare is rigidly enforced. At the same time we allow many paranoics the freedom of the country and they occasionally assassinate a President. Psychopaths are not infrequently elected to public office and epileptics are not disqualified from driving high-powered and dangerous motor vehicles. The engineers of our fastest trains must not be color blind, but they occasionally are victims of the most fatal of all mental diseases,—general paresis. The navigating officer of a transatlantic liner, responsible for the lives of hundreds of passengers, must pass an examination for a license, but he may be dominated by delusions which escape observation because they are not looked for. Important trials, where human lives were at stake, have been presided over by insane judges. Army officers in command of troops in time of war have been influenced by imaginary voices. Insurance companies issue large policies to individuals suffering from