XVIII] TRYPANOSOMA UNIFORME 341 



Undoubtedly the two forms are closely related, but as long 

 as the reaction of experimental animals constitutes one of the 

 means of distinguishing varieties of trypanosomes, it is only 

 increasing the confusion of the subject to unite vivax and 

 cazalboui on purely morphological grounds. 



REFERENCES. 



Bruce, Hamerton, Bateman and Mackie (1910). Proc. Roy. Soc. B, 



vol. 556, p. 368 and vol. 561, p. i. 

 Bruce, Hamerton, Bateman and Lady Bruce (1911). Eleventh Report 



Sleeping Sickness Comm. of Roy. Soc. 

 Yorke and Blacklock (1911). Ann. Trop. Med. and Parasit. vol. v. 



P- 413- 

 Ziemann, H. (1905). Centralbl. f. Bakter. I. Orig. vol. xxxvm. p. 9. 



Trypanosoma uniforme Bruce, Hamerton, Bateman 

 and Mackie, 1911. 



This parasite was first noticed in the blood of oxen in 

 Uganda. It closely resembles T. cazalboui, but may be distin- 

 guished by its smaller size. 



T. uniforme causes a very fatal disease, for two naturally 

 infected cattle died after 5 and 79 days respectively. Goats 

 inoculated with the parasite lived on an average 29 days, but 

 out of three sheep inoculated only one became infected. Fraser 

 and Duke found that two out of 30 bushbuck and sitatunga 

 (Tragelaphus spekei), obtained within two miles of the shore 

 of Lake Victoria, were naturally infected with T. uniforme. 

 Monkeys, pigs, dogs, cats, guinea-pigs and white rats are all 

 refractory to this parasite, another characteristic in which this 

 species resembles cazalboui. 



According to Laveran and Mesnil, uniforme is probably the 

 same as cazalboui, but its small size seems to be a sufficient 

 means of distinction. 



Morphology. T. uniforme is a small and active trypanosome 

 with marked translatory movement, though inferior to that 

 of cazalboui. The parasites are remarkably uniform in size and 

 appearance, the average dimensions being 16 microns in length 

 by 1-5 to 2-5 microns in breadth. The extreme range of 

 variation in the length is only from a minimum of 12 to 



