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Trypanosome Diseases of Domestic Animals im Uganda.* 
V.—Trypanosoma nanum (Laveran). 
By Colonel Sir Davin Bruce, C.B., F.R.S., A.M.S.; Captains A. E. 
HAMERTON, D.S.O., and H. R. Bateman, R.A.M.C.; and Captain F. P. 
Mackik, I.M.S. (Sleeping Sickness Commission of the Royal Society, 
Uganda, 1908-10). 
(Received October 1,—Read December 8, 1910.) 
[Puates 13 anv 14.] 
INTRODUCTION. 
Only two cattle (Experiments 503 and 1118) examined by the Commission 
at Mpumu were found to harbour this trypanosome in their blood. Both 
came from the Uganda Company’s estate at Namukekera, some fifty miles | 
from Lake Victoria, and both had become infected on the estate. 
This species differed from Trypanosoma pecorum, in that it did not affect 
the smaller laboratory animals, such as monkeys, dogs, rats, or mice. 
Guinea-pigs were also refractory to the disease. Horses, mules, donkeys, 
and rabbits were not available at Mpumu, so that it is impossible to say 
what would have been the effect of inoculation in them. Oxen and goats 
were inoculable, but the only sheep experimented on failed to become 
infected, although inoculated with the same blood which infected a goat. 
It seems rash to recognise 7. nanum as a Uganda species on the 
insufficient evidence at our disposal; but yet the fact remains that this 
trypanosome in every case failed to infect the smaller animals, and, more- 
over, by placing these cases on record it will draw the attention of future 
workers to its possible presence. 
MorpPHoLocGy oF TRYPANOSOMA NANUM. 
A. Lwing, Unstained. 
T. nanum is indistinguishable from 7. pecorwm in the fresh and living 
condition. 
B. fixed and Stained. 
Length.—The following table gives the average length of this trypanosome 
in the ox and goat. Twenty trypanosomes are drawn and measured from 
each preparation, the average length reckoned, and the length of the longest 
and shortest given :— = 
* Continued from preceding paper. 
