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motile when first placed in a medium such as described by Erdmann. 

 We have especially noticed this in connection with our work with solid 

 media. Good survival forms of other pathogenic trypanosomes as those 

 causing human sleeping sickness, dourine, and mal de caderas were 

 observed as late as the twenty-eighth day, but in no case did these 

 forms result in positive growth or second generation when transplanted 

 to similar medium under similar conditions. 



In summing up our work we can positively say that at no time, 

 under no conditions were we able to obtain a positive culture using the 

 Erdmann cultural medium. As a matter of fact the easily cultivated 

 trypanosome of Lewis would not develop successfully on this medium. 



