Abstract
White mice and chick embryos were infected with Trypanosoma brucei, T. equiperidum and T. hippicum. After a lapse of 24-36 hrs., streptomycin was administered subcut. to the mice and was injd. into the yolk sac of the chick embryos. Each mouse received a total of 16,000 U. and each chick embryo, a total of 40,000 U. of streptomycin. The course of the disease was followed by microscopic examination of blood specimens taken at regular intervals. As far as could be determined, streptomycin did not alter the course of the infections or prolong the life of the treated mice or embryos.