214 Sir D. Bruce and others. Trypanosome 



Table I. — Laboratory-bred Flies. 



Date. 



1 k ' A ^ < 



TTT-r>f 

 JLipU, 



No. of 

 Hies 

 used. 



Experiment 

 positive or 

 negative. 



No. of 

 flies dis- 

 sected. 



No. of 

 infected 

 flif s found. 



No. of days 

 before flies 

 became infective. 



Temperature 

 at vfhich flies 

 kept. 



ry iz. 

















sept. 7 



1257 



25 



— 



25 









84 h . (29 V.) 



Oct. 23 



1499 



26 





26 



1 







Dec. 3 



1668 



10 





10 









>> 



1913. 

















Jan. 13 



1753 



50 





18 









84° F. (29° C.) 



Mar. 24 



2018 



55 





18 



2 







April 7 



2067 



30 



+ 



30 



3 



24 



)J 



May 9 



2018a 



40 





36 



7 





)) 



June 13 



2226 



40 





8 



1 





1> 



July 21 



2303 



40 





29 









>} 



Aug. 30 



2394 



40 



+ 











58 



?> 



Not. 12 



2433 



20 





15 









' J 



Details of the Two Positive Experiments. 



The following Table gives the details in tbe carrying out of the two 

 positive experiments. They were both carried out with laboratory-bred 

 flies. 



Table II. 





Day 







Result. 













Remarks. 



Date. 



of 



Procedure. 









expt. 





Positive. 



Negative. 









Experiment 2067. 



1913. 













April 7- 













8 













„ 9 



n 



30 flies fed on infected 









„ 10 



3 r 



Eat 2024. 









„ 11 



4] 











„ I 2 



5J 











„ 13 



6 



Starved. 









„ 14 



n 











„ 15 



8 













„ 16 



9 













„ 17 



10 













„ 18 



11 













» 19 



12 













„ 20 



J3 













„ 21 



14 













,> 22 



15 





Fed on clean Dog 2054 ... 



+ 





Trypanosomes appeared 



„ 23 



16 











in blood of Dog 2054 



„ 24 



17 











on the 31st day. 



., 25 



18 













„ 26 



19 











„ 27 



20 











„ 28 



2L 











„ 29 



22 











„ 30 



23 J 









