Ishida1 reported a deficiency of chlorin in the blood of dementia praecox patients and suggested the use of sodium chlorid solution intravenously in the treatment of this condition. He estimated the chlorin values of the blood of five untreated cases of dementia praecox, and the amounts varied from 0.199 to 0.220 per cent. The analyses were made by Professor Horinchi by the Vollhard-Salkowski method. Guthrie2 published a report of the results of the treatment of fifteen cases of dementia praecox based on chemical analyses of the blood and reported a deficiency of chlorin, but the quantities found and the methods of analysis are not mentioned. Rappleye3 stated that in some cases of catatonia he found a deficiency of chlorin. Miller4 quoted analyses made by Weston of the blood of ten cases of dementia praecox, the chlorin being normal in each case, and he stated that "there