520 Sir D. Bruce and others. Trypanosoma 



Table IV. 



Expt, 



Day of expt. 



Procedure. 



Remarks. 



563 



1-3 



4 

 5-52 



Flies fed on infected monkey. 

 Starved. 



Fed on clean Monkey 594. 



All flies negative on dissec- 

 tion. 



668 



1-2 

 3 



4-63 



Flies fed on infected dog. 

 Starved. 



Fed on clean Dog 699. 



One infected fly found on 

 the 42nd day. 



879 



1-2 

 3 



4-32 

 33-63 



Flies fed on infected monkey. 

 Starved. 



Fed on clean Monkey 910. 

 Fed on clean Monkey 1073. 



Seven infected flies found. 



1072 



1-3 

 4 



5-54 



Flies fed on infected dog. 

 Starved. 



Fed on clean Dog 1148. 



Three infected flies found. 



1494 



1-3 

 4-5 

 6-44 



Flies fed on infected monkey. 

 Starved. 



Fed on clean Monkey 1514. 



Three infected flies found. 



1560 



1-3 



4 

 5-37 



Flies fed on infected monkey. 

 Starved. 



Fed on clean Monkey 1581. 



All flies negative on dissec- 

 tion. 



1686 



1-4 

 5 



6-43 



Flies fed on infected monkey. 

 Starved. 



Fed on clean Monkey 1704. 



Two infected flies found. 



1710 



1 



2 

 3-47 



Flies fed on infected dog. 

 Starved. 



Fed on clean Monkey 1718. 



All flies negative on dissec- 

 tion. 



Kesult of the Dissection of the Infected Flies. 



All the flies dying during the progress of these experiments were dissected. 



In the three positive experiments with the laboratory-bred flies nine infected 

 flies were found. The following table gives the results of the dissection of 

 these nine flies. The second column gives the number of days which elapsed 

 between the fly's first infected feed and its death and dissection. In the 

 third column the labial cavity and hypopharynx are included under 

 " Proboscis." At the time these experiments were made no attempt was 

 made to distinguish between the two parts, as has been done lately in the case 

 of T. simice* When the proboscis is marked positive, as in Table VI, it may 

 be that the trypanosomes are contained in the labial cavity or the hypo- 

 pharynx, or both. 



In the development of T. gamhiense in G. palpalis trypanosomes were never 



* ' Roy. Soc. Proc.,' B, vol. 87, p. 59 (1913). 



