HUMAN TRYPANOSOM1ASIS 



133 



act as alternate hosts are not present in South Africa and 

 South America, and though the disease has been intro- 

 duced there it has not spread. The South American 



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FIG. 38. Chart III, 1910. Two other periods some three months later, showing 

 absence of any marked beneficial effect from these drugs. Trypanosomes were 

 usually to be found. 



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FIG. 39. Chart IV, 1910. Marked temporary effect of intravenous injections 

 of tartar emetic. The trypanosomes, which before the injection were 3 to 200 

 leucocytes, were not found for three days, but became as numerous as before in six 

 days. The severity of the reaction is indicated by the temperature. 



disease due to a trypanosoma will be considered 

 separately. 



Clinical History. Little is known as regards the onset 



