DISEASES DUE TO PATHOGENIC TRYPANOSOMES 



559 



Schneider and Bufford, Nocard and others. In 1901 the disease was 

 first described by Salmon as having been found in the United States, 

 and in 1907 Rutherford, Higgins, and Watson gave an elaborate and 



FIG. 192 





Magnified head of tsetse fly, Glossina morsitans. (Author's preparation.) 



lucid account of their observations of, and experiments with, dourine 

 infections encountered in Northwestern Canada. 



African Sleeping Sickness. This is a very fatal disease of human 

 beings, and is due to Trypanosoma gambiense. 



