Strain of T. brucei from Zululand. 509 



Table VII. — Percentage of Posterior-Nuclear Forms found among the Short 



and Stumpy Varieties of T. brucei, Zululand Strain, 1913. 



Date. 



Experiment 

 No. 



Animal. 



Percentage among snort 

 and stumpy forms. 



1912. 









June 22 



I 



Horse 



30 



„ 25 



II 



>i 



Dog 



65 



— 



I 



5 



June 21 



11 



>! 



Nil 



1913. 









Feb. 8 



1828 



Rat 



1 



J 9 



1828 



i> 



37 



„ 10 



1828 





63 



» 11 



1828 



33 



36 



„ 12 



1828 



33 



32 



„ 13 



1828 



33 



17 



„ 14 



1828 



3! 



54 



„ 15 



1828 



>, 



45 



„ 16 



1828 



) 



20 



„ 17 



1828 



33 



17 



Mar. 24 



2006 



)! 



10 



„ 25 



2006 



13 



54 



„ 26 



2006 



Jl 



41 



„ 27 



2006 



33 



18 



„ 28 



2006 



33 



38 



„ 29 



2006 



73 



32 



Apr. 1 



2006 



33 



69 



Mar. 2 



2006 



), 



74 



„ 3 



2006 





63 





2006 



3' 



74 



July 21 



2288 





Nil 



» 22 



2288 



J3 



42 



„ 23 



2288 





20 



„ 24 



2288 



'3 



35 



„ 25 



2288 





16 



„ 26 



2288 



3' 



29 



„ 27 



2288 





43 



„ 28 



2288 





52 



„ 29 



2288 



33 



49 



„ 30 



2288 



Mouse 



61 





I 



5 



Average 



37 -8 



These two curves are undoubtedly much alike, and as the wild-game strain 

 in Nyasaland is supposed to be identical with the human strain, then it 

 might be said that T. brucei, Zululand strain, 1913, is also identical with the 

 trypanosome causing disease in man in Nyasaland. Others will say that the 

 Zululand trypanosome and the ISTyasaland wild-game strain are both T. h'ucei, 

 but that this does not prove that T. brucei is identical with the human strain. 

 No, but if it is shown that T. brucei, Zululand, is absolutely identical in 

 morphology with this Nyasaland human strain, that it also has exactly the 

 same disease-producing power on the various experimental animals, this will 



VOL. LXXXVII. — B 2 R 



