If we figured the earning capacity of the 62,000 persons admitted to institutions for mental diseases in the United States as averaging only one thousand dollars per year, it would represent an economic loss to the country of sixty-two millions of dollars annually. Estimated in the same way, the total population of the hospitals would represent the staggering sum of nearly two hundred and forty million dollars. This, of course, does not take into consideration at all the cost of maintenance or the property investment represented by hospitals. To avoid any possibility of confusion, no reference has been made heretofore to statistical studies of mental deficiency or epilepsy. From a public health point of view, however, and as social and economic problems, they are questions which cannot be disregarded in a consideration of mental diseases. As a matter of fact, they are very closely correlated in many ways. A survey made by the National Committee for Mental Hygiene shows that on January 1, 1920, there were in this country thirty-two state institutions for mental defectives, eleven admitting both feebleminded and epileptics and twenty exclusively for the latter class.[6] In addition to this, one city institution was reported. Of the private hospitals twenty-seven care for the feebleminded only, and six for epileptics, while nineteen admit either of these classes. The total number of mental defectives in institutions on January 1, 1920, was 40,519. At that time 34,836 were in state, 2,732 in other public institutions and 2,951 in private hospitals. In the following states they are cared for in hospitals for mental diseases, no other provisions having been made for their treatment:—Alabama, Arizona, Arkansas, Florida, Louisiana, Mississippi, Nevada, South Carolina, Tennessee, Utah and West Virgina. The states reporting the largest number are New York 5,762, Pennsylvania 4,281, Massachusetts 3,192, Illinois 3,147, Ohio 2,435, Michigan 1,849, Iowa 1,704, New Jersey 1,762, Wisconsin 1,624, Minnesota 1,502, Indiana 1,264 and Missouri 1,047. At the same time there were 14,937 epileptics under treatment, 13,223 in state, 859 in other public institutions and 855 in private hospitals. Colorado, Delaware, Georgia, Nebraska, New Mexico and Washington take care of the epileptics in their hospitals for mental diseases. The intimate relation between mental diseases and epilepsy is shown by the fact that as nearly as can be determined at this time approximately thirty per cent of all of the epileptics in our state institutions have been committed as insane. This, however, nowhere nearly includes all of the cases which actually show mental disorders of one kind or another. The states showing the largest numbers of epileptics are New York with 1,683, Ohio 1,680 and Massachusetts 1,227. No other states report over one thousand, although Michigan and Pennsylvania have over eight hundred and Illinois and Missouri over seven hundred.