370 Col. Sir D. Bruce and others. [Apr. 18, 



The following table gives the principal details of the experiment : — 



Date. 



Day 

 of experi- 

 ment. 



Procedure. 



Result. 

 Positive, j Negative. 



Remarks. 



1909. 













Mar. 31 



— 



Flies fed on infected 













monkey. 









Apr. 1 



1 



■> >' 









„ 2 



2 



J) 









„ 3—4 



3—4 



Flies starved 72 hours. 









„ 5—8 



5—8 



Flies fed on healthy 





— 









monkey, 657 









„ 9—12 



9—12 



Flies fed on healthy 













monkey, 677 









„ 13 



13 



Flies fed on healthy 













monkey, 702 









„ 11 



14 



Flies fed on healthy 













monkey, 703 









„ 15 



15 



Flies fed on healthy 













monkey, 704 









„ 16 



16 



Flies ted on healthy 













monkey, 705 ! 







„ 17—21 



17—21 



Flies fed on healthy ! 











monkey, 706 1 







„ 22— 



22—52 



Flies fed on healthy 









May 22 





monkey, 728 









Remarks. — These 60 Lake-shore or wild flies, although fed on an infected monkey for 

 three days, failed to convey the infection to healtliy monkeys. As the flies died they 

 were dissected. Only in one were flagellates found, and these appeared to be of the 

 Trypanosoma (jrayi type. An emulsion was made of the contents of the alimentary canal 

 •of this fly and injected into monkey 914. Monkey 914 never showed trypanosomes in 

 its blood, although kept under observation for a month. 



Experiment 656. 





Day 





Besult. 











Bemark's. 



Date. 



of experi- 



Procedure. 









ment. 





Positive. 



Negative. 





1909. 













Apr. 3—5 



1—2 



280 (lies fed on in- 











focted monkey. 









6—7 



3—4 



Flies starved 11 liours. 









„ 8-17 



5-14 



Flies fed ou lienltliy 













monkey, t)75 









„ 18 



IT) 



Flies fed on healthy 













monkey, 712 









„ 19 



k; 



Flies f<'d on healthy 













monkey, 713 









„ 20 



17 



Flics fed on healthy 













jiioiikey, 714 









21 



18 



Fill's fed on healthy 













monkey, 715 









„ 22—25 



19-22 



Flics fed on healtliy 













monkey, 716 









„ 20—28 



23—25 



Fli(^3 starved. 









,. 29- 



26—75 



Flies ftul on healthy 







.Tune 8, 8 (lies alive. 



June 17 





monkey, 744 







.luiie 18,2 lH<>a alive. 



