Trypanosome causing Disease in Man in Nyasaland. 35 



DESCRIPTION OF PLATES. 

 Plate 1. 



T. brucei vel rhodesiense. Short and stumpy forms, 16-^1 microns in length. Stained 

 Giemsa. x 2000. 



Plate 2. 



T. brucei vel rhodesiense. Intermediate forms, 22-24 microns in length. Stained 

 Giemsa x 2000. 



Plate 3. 



T. brucei vel rhodesiense. Long and slender forms, 25-32 microns in length. Stained 

 Giemsa. x 2000. 



The Trypanosome causing Disease in Man in Nyasaland. — 

 Susceptibility of Animals to the Human Strain. 



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

 Harvey and A. E. Hamerton, D.S.O., K.A.M.C. ; and Lady Bruce, 

 B.B.C. 



(Scientific Commission of the Koyal Society, Nyasaland, 1913.) 

 (Received May 26— Read June 12, 1913.) 

 Introduction. 



In previous papers the morphology of various strains of this trypanosome 

 — from man, wild game and wild Glossina morsitans — was described, and the 

 different strains compared. 



This paper describes the action on animals of the five strains derived 

 from cases of trypanosome disease in man in Nyasaland, and compares 

 their virulence. In a future paper it is proposed to describe in the same way 

 the action on animals of the Wild-game and Wild G. morsitans strains, but up 

 to the present this has been impossible on account of the scarcity of 

 experimental animals. 



D 2 



