The tests of peritoneal absorptive function with PSP by Matsunaga and Matsuda were reexamined. And the results were as follows. 1. In healthy rabbits, the maximum concentration of excretion into urine was 16.6% the arival time to the maximum value was 45 minutes and it was a little different to the results and it was same to that by the method which took the value at 1 or 2 hours after the injection of pigment as the standard value. 2. In the rabbits with damage by chloroform and carbon tetrachloride, the decline of maximum value, the delay of arrival time to the maximum value and the prolongation of course etc. were not defined in the former, but the delay of the arrival time to the maximum value was only observed of the letter. It was thought that these results showed not only the decline of peritoneal absorptive function in liver damage by the above drugs, but also the kidney damage by drugs, 3. In the cases with kidney damage by corrosive sublimate, the maximum value of excretion was 4.5-5.0%, the arrival time to the maximum value was 3 hours and the intervention of the factor by kidney damage was remarkable.