1912.] Bradford, 1899, and Trypanosome from Uganda Ox. 191 



our notions of specificity of trypanosomes, at least in laboratories. Of such a 

 change we have at present not much evidence. We have noted, however, 

 above that the Uganda strain kept in mice for a year was almost (but not 

 entirely) monomorphic, but that in guinea-pigs it at once showed its normal 

 characters. 



It is impossible at present to decide between these explanations. 



We come back, therefore, to the fact of which we ourselves have no doubt, 

 viz., that the trypanosome that Plimmer and Bradford worked with, and 

 which they named T. brucei in 1899, is certainly now a monomorphic 

 trypanosome, and is not the same as the trypanosome from the ox described 

 under the same name by Bruce and others in Uganda. 



We believe, then, that the facts we have brought forward prove the 

 non-identity of the Zululand and Uganda strains. 



In order to avoid confusion, we think it advisable that this Uganda 

 trypanosome should be re-named. We therefore propose for it the name 

 T. ugandoe. 



EEFERENCES. 



(1) Bruce, ' Further Report on the Tsetse-fly Disease or Nagana in Zululand,' by 



Surgeon-Major David Bruce, A.M.S. (1896 ?), Harrison and Sons, London. 



(2) Kanthack, Durham, and Blandford, ' Roy. Soc. Proc.,' 1898, vol.' 64, p. 100. 



3) Plimmer and Bradford, " A Preliminary Note on the Morphology and Distribution 

 of the Organism Found in the Tsetse-fly Disease," 'Roy. Soc. Proc.,' 1900, 

 vol. 65, p. 274. 



{4) Bradford, J. R., and Plimmer, H. G., "The Trypanosoma brvxei, the Organism 

 Found in Nagana or Tsetse-fly Disease," 'Quart. Journ. Micro. Sci.,' 1902, 

 vol. 45, p. 449. 



(5) Bruce and others, ' Reports of the Sleeping Sickness Commission of the Royal 



Society,' 1911, No. XI, p. 147. 



(6) Bruce, ibid., 1912, No. XII, p. 24. 



{7) Laveran, " Identification et essai de classification des trypanosomes des mammi- 

 feres," 'Ann. de l'lnstitut Pasteur,' July, 1911, No. 7, p. 497. 



