1907.] Experimental Treatment of Trypanosomiasis in Rats. 515 



trypanroth and some form of mercury have given the best results. In 

 thinking of human trypanosomiasis in this connection, the danger of the pro- 

 duction of an atoxyl-proof strain will be at once apparent : so that atoxyl 

 should be given to human beings with the greatest care and forethought. 



The following Table YII summarises the few results we have obtained so 

 far. Eat JSTo. .1 was inoculated from a Nagana rat which had become 

 uninfluenced by atoxyl after the third recurrence, before which large and 

 repeated doses had been given : and Eat No. 11 was inoculated from a Surra 

 rat in a similar condition. 



