366 



V'arious other trypanosomes have been des- 

 cribed in cattle, horses, and canaels in Uganda, 

 Algeria, Soudan, Somaliland, Togoland, German 

 East Africa, etc. Their relationships are at present 

 doubtful. 



Trypanosomes have also been recorded from time to time 

 jn many other mammals, e.g., rabbit, hamster, dormouse, bat, 

 squirrel, lemming, souslik, gainea-pig, Gambian mouse, field 

 mouse, and mole. In the Gambian mouse the trypanosome is 

 said to possess no undulating membrane. The trypanosomes 

 in these various animals have a general resemblance to T. lewisi, 

 but most are insufficiently described. 



Dimensions of Trypanosomata Found in 

 Mammals 



T. lewisii - - 24T25 ^t by 1-4 m 



T. brucei - 25-30 ^i by i'5-2'5 /u 



T. equiperdum 18-26 m by .2-2"5 m 



T. evansi - - 20-30 /"by 1-2 m 

 T. equinum 20-25 '" by 2-3 /^ 



T. gambiense 18-25 i^ by 2-2'8 m 



T. theileri 30-65 m by 2-4 /u 



T. transvaliense 18-50 m by 4-6 m 



Considerable variation exists between the 

 data of observers, and though these figures can 

 be considered as approximately correct, they do 

 not suffice for distinguishing the various species. 

 Whether it will be possible to distinguish 

 nearly allied species morphologically, e.g., T. briicei 

 and T. evansi, remains to be seen. Differences in 

 the position of the blepharoplast and differences in 

 staining properties hardly suffice in similar species 

 that resemble one another closely, and at present 

 the only certain method is their pathogenic pro- 

 perties. 



Inoculation. — The most certain and rapid 

 method is intraperitoneal, e.g., in the case of 



