1) The writer measured the photoelectric effect and the threshold wave length of albumin, casein, peptone, gelatin, globulin and haemoglobin in their various conditions. 2) Albumin which is almost perfectly dry by heating, shows photoeectric effect even with the longer visible rays than 5600Å. The threshold wave length of albumin changes according to its humidity. 3) The threshold wave length of solid peptone is longer than that of its aqueous solution. 4) The writer found the apparent photoelectric effect of casein which was considered not photoelectrical. 5) We can sensitively detect albuminuria by means of photoelectric effect.

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The author compared the whole course of the blood coaguration in the cases of anemia and rheumatic purpura with that of a normal person and obtained the results as follow. The time duration of the first and the beginning phase of the coagulation of these patients and that of the completing phase in case of rheumatic purpura showed prolongation. The mean-value of the hardness in the completing phase of the coagulation of these patients increased, but showed no difference from the normal in the beginning and the active phase.

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