394 



Morphology of Various Strains of the Trypanosoma causing 

 Disease in Man in Nyasaland. — The Wild-game Strain. 



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

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

 B.E.C. 



(Scientific Commission of the Royal Society, Nyasaland, 1912.) 

 (Received February 24 —Read April 10, 1913.) 



Introduction. 



Trypanosomes of this species, isolated from five antelope, are here described 

 and compared with the Human strains which formed the subject of a 

 previous paper.* The Wild-game strains were isolated by injecting blood 

 of antelope into susceptible animals. The blood was, as a rule, injected 

 into a healthy goat, monkey, and dog, and from these other animals were 

 inoculated. 



Trypanosomes from the following species were studied : reedbuck, water- 

 buck, oribi, and hartebeeste. In these experiments, with the exception of 

 the oribi, the three inoculated animals became infected. In the case of 

 the oribi the blood was inoculated into a monkey and dog, no goat being 

 available, and the monkey alone took the disease. 



I. Morphology of Strain I, Iteedbuck.- 



The following table gives the average length of this trypanosome as found 

 in the rat, 500 trypanosomes in all, and also the length of the longest and 

 shortest : — 



Table I. — Measurements of the Length of the Trypanosome of Strain I, 



Reedbuck. 



Date. 



Method of fixing. 



Method of 

 staining. 



In microns. 



Average 

 length. 



Maximum 

 length. 



Minimum 

 length. 



1912 



Osmic acid 



Grienisa 



21 -7 



34-0 



16 -0 



* Supra, p. 285. 



