Investigating the functions of reticuloendothelial systems in the sensitized rabbits with hetero-organ antigens (brain, kidney, mucous membrane of small intestine etc.). Also the effects on sensitizations after administrations of Nitromin were observed. The following results were obtained. 1. Productions of antibodies for hetero-organ antigens were depressed in the sensitized rabbits with hetero-organ antigens blocking reticuloendothelial systems with Indian-ink. 2. The antibodies for hetero-organ antigens were slightly increased in the sensitized rabbits with hetero-organ antigens about 4 hours after the administration of Communin. 3. After the administration of Nitromin, the productions of antibodies for hetero-organ antigens were depress...