When it comes to an analysis of the various forms of manic-depressive psychoses reported, the indications are not so clear. In New York during 1918 and 1919 there were 1,980 cases distributed as follows:— _Type_ _Number_ _Percentage_ Manic 905 45.71 Depressive 729 36.82 Stuporous 53 2.68 Mixed 245 12.37 Circular 48 2.42 During the eight-year period referred to above in the New York hospitals there were 6,091 cases of manic-depressive and allied conditions, classified as follows:— _Type_ _Number_ _Percentage_ Manic 2952 48.46 Depressive 2014 33.06 Stuporous 76 1.24 Mixed 773 12.69 Circular 199 3.26 The fourteen Massachusetts hospitals reported 672 cases in 1917 and 1918, classified as follows:— _Type_ _Number_ _Percentage_ Manic 222 33.03 Depressive 373 55.50 Stuporous 4 .59 Mixed 66 9.82 Circular 7 1.04 In the twenty-one hospitals in fourteen other states there were 3,409 cases of manic-depressive psychoses as follows:— _Type_ _Number_ _Percentage_ Manic 1401 41.09 Depressive 1365 46.04 Stuporous 62 1.82 Mixed 228 6.69 Circular 94 2.76 The total from all of these institutions, of 12,152 cases, was classified as follows:— _Type_ _Number_ _Percentage_ Manic 5480 45.09 Depressive 4481 36.87 Stuporous 195 1.60 Mixed 1312 10.79 Circular 348 2.87 It will be noted that manic cases are more common than the depressive in New York, the number of the former being fifteen per cent greater than the latter. In Massachusetts the number of depressive forms is twenty-two per cent higher than the manic. In the other states the depressive types are less than five per cent higher than the manic. In all institutions the mixed forms are more common than the circular or stuporous. The stuporous forms constitute the smallest percentage reported in all hospitals, except in 1918 and 1919 in New York. We would be warranted, apparently, in the conclusion that in this country manic forms are the more common, the depressive being second in frequency, followed by the circular and stuporous types in the order mentioned.