This investigation was begun July 1, 1924. Since that time we have treated about 300 patients and tabulated results on 220 of these are available for the present report. The total number of treatments given these patients was about eight hundred.
The method of liberating chlorin is practically the same regardless of the apparatus. One type of apparatus liberates free chlorin into the treatment room and depends on the dilution after liberation. The other type generates chlorin and makes the proper dilution before it is liberated. The principle of liberation is the displacement of water and measurement in cubic centimeters of the amount displaced. Each liberation is called one pulsation and varies in amount according to the type of apparatus. The dilution of chlorin in the room should remain constant and this is a technical difficulty in the treatment.
Clothing, metals, ventilation and humidity have to be taken into account,