1911.] Antelope Infected ivith Trypanosoma gambiense. 489 



Table II — continued. 



Experi- 

 ment 

 No. 



1 No. of 

 flies used 

 in 

 experi- 

 ment. 



• 



No. of 

 flies 

 dissected. 



No. of 

 infected 

 flies 



Per- 

 centage 

 of 



infected 

 flies. 



Result 



of 

 experi- 



Remarks. 









Reedbuck, Expt. 2431. 





98 



1 81 



8 













268 



i 60 



53 





3 7 



+ 





399 



43 



36 



I 









401 



25 



14 













598 



88 



45 













656 



! 66 



35 



















Waterbuck, Expt. 2378. 





6 















+ 





217 



168 



53 



2 



3-8 







406 



54 



36 













471 



96 



18 













488 



45 



44 













523 





31 













622 



62 



20 













Table III. — Summarising Experiments of Tables I and II and grouping them 

 according to Length of Time the Antelope had been infected. 



Species of 

 antelope. 



Days after 

 original 

 infection 

 of 



antelope. 



No. of 

 experi- 

 ments. 



No. of 

 positive 



ments. 



No. 



On 

 1st day. 



of flies. 



On 

 30th day. 



No. of 

 flies 

 dissected. 



No. of 

 infected 



flies 

 found. 



Bushbuck 2328 ... 



100—200 



1 



1 





? 











2371 ... 





2 

 2 



1 





? 



88 

 66 







2372 ... 

 2428 ... 





2 



2 

 1 







34 



2 



2 



Reedbuck 2357 ... 





2 



1 



193 



80 



76 



4 1 



2359 ... 





2 



2 



259 



140 



183 



5 



2427 ... 





4 



2 



190 



105 



134 



3 



2431 ... 





4 



2 



209 



125 



111 



2 



Waterbuck 2378... 





2 



1 



? 





53 



2 



Bushbuck 2328 ... 



200—300 



3 







217 



126 



163 







2371 ... 





4 



1 



197 



113 



166 







2372 ... 





4 



1 



238 



108 



188 



1 



Reedbuck 2357 ... 





3 



2 



194 



118 



148 



8 



2359 ... 





3 



1 



151 



66 



112 



3 



2431 ... 





2 







154 



74 



80 







Waterbuck 2378... 





4 







231 



61 



129 







Bushbuck 2328 ... 



300—342 



3 







112 





105 







2371 ... 





1 







73 



49 



51 







2372 ... 





1 



1 



64 



48 



59 



2 



Reedbuck 2357 ... 











216 



119 



142 







2359 ... 

 Waterbuck 2378.. 





i I 







33 



29 



30 









1 







62 



15 



20 







