1912.] Reservoir for Trypanosoma gambiense. 



303 



Eeedbuck 2359. 



Original infection April, 1910, with human strain of T. gambiense. Latest 

 evidence prior to this paper of the infectivity of this animal obtained in 

 December, 1911, when it infected laboratory-bred Gf. palpalis. 



Fly Experiments. 









Number of flies 





Length 



Eesult 



of 

 feeding 



monkey. 





Expt. 

 No. 



Period for which 

 flies fed upon 2359. 



1st 

 day. 



30th 

 day. 



Dissected 

 during 

 experi- 



Con- 

 taining 

 flagel- 



of 



Eemarks. 



76 

 78 

 548 



May 19—27, 1911 

 May 20—27 „ 

 Dec. 6—11 



67 



49 

 94 



63 

 42 

 59 



67 

 94 





 

 



53 

 53 

 40 





Fed on monkey through- 

 out experiment. 





Totals 



210 



164 



210 























Experiments 76 and 78 were nourished on cock's blood throughout the 

 earlier days of the experiment. 



Injection Experiments. 



Date. 



Expt. No. 



Quantity of blood injected. 

 Pure. Citrated. 



Eesult. 



Animal used for 

 injection. 



16.5.11 



62 





2,e.c. 





Monkey. 



16.5.11 



63 





20 n\ 





White rat. 



15.7.11 



199 



5 





Monkey. 



24.1.12 



631 



8 







16.2.12 



657 











In the case of Experiment 199 the incubation period in the monkey was 

 18 days. A curious point about this monkey, established by my own 

 experiments and those of Miss Robertson, is the relatively large number of 

 positive flies which have been found in boxes fed upon it. Full confirmation 

 is at present lacking, but it would seem that the prolonged sojourn of 

 T. gambiense in the buck had resulted in a strain peculiarly adapted to 

 development in G. palpalis* 



* Cf. Bushbuck 2371, infra. 



