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Inflammatory processes were provoked in 35 rats by subcutaneous implantation of sterile cotton-wool pads and treated five days by means of various antiphlogistic substances. The action of sodium salicylate (administered alone or in conjunction with gamma-globulin or with glucose) proved similar to that of prednisolone which was given as control substance. Human gamma-globulin exhibited neither anti-inflammatory nor pro-inflammatory effects. Experiments with twelve rabbits revealed that the pyretogenic potential of sodium nucleinate, one per cent (0.01 g/kg body weight) was stronger than that of animal charcoal or peptone. Yet, the two latter substances may be used, as well. The antipyretic effect of sodium salicylate was not as intensive but just as reliable as that of aminophenazone, when both preparations were applied to rabbits with induced fever. Concomitant administration of glucose is recommended to prevent development of undesired side-effects, such as giddiness or ataxia.