522 Sir D. Bruce and others. Trypanosome 



gland infection. The glands were swarming with trypanosomes, and a portion 

 of one of them injected under the skin of Eat 2417 gave rise to infection. 



Table VI. — Wild Flies. Result of the Dissection of the Infected Flies found 



in the Positive Experiments. 



Expt. 



Time, 

 days. 



Proboscis. 



Proventri- 

 culus. 



Fore-gut. 



Mid-gut. 



Hind-gut. 



Salivary 

 glands. 



IDoU 



c 

 o 









+ 









±Oo\J 



1Q 









+ 







IDOU 



v> 



+ 



+ + 



+ + 



+ + 



+ + 



+ + 



xoou 









+ 



+ 



+ 





IDOu 



CO 





+ + 



+ + 



+ + 



+ + 





X\jO\J 



33 









T 







lOOU 



oo 







+ + 



+ + 



+ + 





1680 



33 



- 



- 



+ 



+ 





- 



1688 



10 









+ 







1688 



10 









+ 







1688 



11 









+ 







1688 



13 









+ 







1688 



15 





+ + 



+ + 



+ + 



+ + 



+ + 



1688 



15 



+ 







+ 







1705 



8 



+ 



+ 



+ 



+ 







1705 



8 





+ 



+ 



+ 







1705 



10 









+ 







1705 



11 







+ 









1705 



12 



+ 



+ 



+ 



+ 



+ 



+ + 



1705 



26 







+ + 



+ + 



+ + 



+ + 



1705 



33 





+ 



+ + 



+ + 



+ + 



+ + 



1748 



31 







+ + 



+ + 



+ + 



+ + 



1729 



48 



+ 



+ 



+ 



+ 



+ 



+ + 



In Experiment 1680, eight flies were found to be infected. In seven the 

 flagellates were confined to the alimentary tract. The eighth had a well- 

 marked invasion of the salivary glands. In this case trypanosomes were also 

 seen in the proboscis, but whether in the labial cavity or the hypopharynx is 

 not specified. 



In Experiment 1688, six flies were found to contain trypanosomes in the 

 alimentary canal. In one of these there was also infection of the salivary 

 glands, which were crowded with trypanosomes. This fly must have been 

 naturally infected when caught, as sufficient time had not elapsed since the 

 infected feed to allow of time for development to take place. The flagellates 

 contained in the salivary glands injected into Eat 1721 gave rise to infection. 



In Experiment 1705, seven infected flies were found. Three of these had 

 the salivary glands invaded. One of these, the fifth, must also have been a 

 naturally-infected wild fly. 



In Experiment 1748, only one infected fly was found. It had a copious 

 infection of the salivary glands, a portion of which injected into Eat 1852 

 gave a positive result. 



