Strain of T. brucei from Zululand. 



495 



About this time (1898) the trypanosome was handed over to Bradford at 

 the Brown Institute and named T. brucei in a paper written in 1899.* 



That the trypanosome named by Plimmer and Bradford was the same as 

 that sent to Kanthack, Durham, and Biandford in 1896 there can be no 

 reasonable doubt^ There was no other species of pathogenic trypanosome 

 in any English laboratory at the time, with the exception, perhaps, of 

 T. lewisi, with which there could be no confusion. 



Now, having shown that the original Zululand strain was a well-marked 

 dimorphic type of trypanosome, let us see how it compares with the 1913 

 strain. 



Mr. Shilston kindly sent the Commission a description of this strain made 

 immediately after it had come from Zululand. He states that in the living 

 condition the variation in size and shape of the organism can be observed, 

 the long, slender flagellated forms being readily distinguished from the short, 

 stumpy forms, while all gradations between these two can be found ; that 

 the circular vacuole close to the micronucleus is very distinct ; and that, 

 although the organisms are actively motile, their progression is not rapid 

 and frequently they simply travel in a small circle. 



Chart 1. — Curve representing the Distribution, by Percentages, in respect to Length, of 

 400 Individuals of T. brucei, Zululand Strain, 1913 (Shilston's measurements). 



IWTcrons 



13 



14 



15 



16 



17 



18 



19 



20 



21 1 22 



23 



24|2S|26]27 



28|29 



30 



31 1 32 



33} 34 



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* "A Preliminary Note on the Morphology and Distribution of the Organism found 

 in the Tsetse-fly Disease," by H. G. Plimmer and J. Eose Bradford, ' Eoy. Soc. Proc.,' 

 vol. 65, p. 274. 



2 Q 2 



