causing Disease in Man in Nyasaland. 



205 



Table XXV. — Comparison of the Measurements of the Breadth of the 

 Trypanosomes of the Human Strains Yl to X. 



Date. 



Experiment 

 No. 



Strain. 



Animal. 



In microns. 



Average 

 breadth. 



Maximum ; Minimum 

 breadth. \ breadth. 



1913 



2239 



1913 



223H 



1913 



2300 



1913 



2386 



1913 



2437 



VI, Manakumpara 



VII, Yoramu 



VIII, Mekka 



IX, Mkanthama .. 

 X, Dongolosi 



Eat 



2 -76 



4-50 



125 



2 -51 



4-50 



1 25 



2-68 



5 00 



1 -25 



2-56 



5 -00 



1 -25 



2'7l 



4-50 



1 25 



2 '65 



5 -00 



1 -25 



Conclusion. 



These further five strains of this trypanosome, isolated from five natives in 

 Nyasaland, belong to the same species, Trypanosoma brucei vel rhodesiense, the 

 trypanosome causing disease in man in Nyasaland. 



The Trypanosome causing Disease in Man in Nyasaland. 

 II. The Wild-game Strain. III. The Wild Glossina 

 morsitans Strain. Part II.- — Susceptibility of Animals. 



By Surgeon-General Sir David Bruce, C.B., F.E.S., A.M.S. ; Major A. E. 

 Hamerton, D.S.O., and Captain D. P. Watson, R.AM.C. ; and Lady 

 Bruce, E.E.C. (Scientific Commission of the Eoyal Society, Nyasaland, 

 1912-14.) 



(Received May 5, — Read June 25, 1914.) 

 Introduction. 



In previous papers* the morphology of these strains of trypanosomes 

 was described, and it was concluded that they are identical with the try- 

 panosome causing disease in man in Nyasaland, the Trypanosoma rhodesiense 

 of Stephens and Fantham, the T. brucei of this Commission. 



This paper tabulates the action on animals of the two strains, and they 

 are compared in this respect with each other and with the Human strain. 

 * ' Koy. Soc. Proc.,' B, vol. 86, pp. 394 and 408. 



VOL. LXXXVIII. — B. R 



