528 Sir D. Bruce and others. Description of a 



Table III. 



Expt. 



Day of expt. 



Procedure. 



Remarks. 



• 



1909 



1-9 

 10 

 11-29 



Flies fed on infected monkey. 

 Starved. 



Fed on clean Monkey 1970. 



Trypanosomes appeared in 

 blood of Monkey 1970 on 

 the 28th day. 



1988 



1-8 



9 



10-22 



23 

 24-29 



Flies fed on infected dog, 



monkey, and goat. 

 Starred. 



Fed on clean Dog 2007. 

 Starved. 



Fed on clean Monkey 2058. 



Trypanosomes appeared in 

 blood of Dog 2007 on the 

 20th day. 



Monkey 2058 showed trypano- 

 somes on the 30th day. 



2188a 



1-9 



10 

 11-22 



23 

 24-27 



Flies fed on infected guinea- 

 Starved. 



Fed on clean Dog 2254. 

 Starved. 



Fed on clean Monkey 2298. 



Trypanosomes appeared in 

 blood of Dog 2254 on the 

 21st day. 



Monkey 2298 showed trypano- 

 somes on the 32nd day. 



2309 



1-7 

 8 



9-42 



Flies fed on infected dog. 

 Starved. 



Fed on clean Monkey 2316. 



Trypanosomes appeared in 

 blood of Monkey 2316 on 

 the 41st day. 



2313 



1-4 

 5 



6-15 

 16 

 17-31 



Flies fed on infected monkey. 

 Starved. 



Fed on clean Monkey 2318. 

 Starved. 



Fed on clean Dog 2361. 



Trypanoeomes appeared in 

 blood of Dog 2361 on the 

 31st day. 



Monkey 2318 never showed 

 trypanosomes. 



Details of the Four Negative Experiments. 

 The following table shows the method of procedure in carrying out the four 

 negative experiments. In each of them laboratory-bred flies were used : — 







Table IV. 





Expt. 



Day of expt. 



Procedure. 



Remarks. 



1857 



1-8 

 9 



10-60 



Flies fed on infected monkey. 

 Starved. 



Fed on clean Monkey 1941. 



One infected fly found on the 

 62nd day. 



1996 



1-9 

 10 

 11-55 



Flies fed on infected monkey. 

 Starved. 



Fed on clean Monkey 2031. 



Four infected flies found. 



2111 



1-8 



9 



10-14 



15 

 16-30 



31 

 32-43 



Flies fed on infected dog. 

 Starved. 



Fed on clean Dog 2100. 

 Starved. 



Fed on clean Monkey 2125. 

 Starved. 



Fed on clean Dog 2189. 



Three infected flies found. 



2188 



1-8 



9 



10-27 



Flies fed on infected rat. 

 Starved. 



Fed on clean Monkey 2203. 



One infected fly found on the 

 21st day. 



