PROCEEDINGS OF 



THE ROYAL SOCIETY. 



Section B. — Biological Sciences. 



Trypanosome Diseases of Domestic Animals in Nyasaland. 

 III.— Trypanosoma pecorum. 



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

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

 E.E.C. 



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

 (Eeceived April 14— Eead May 8, 1913.) 



Introduction. 



This trypanosome has been found in the neighbourhood of the camp at 

 ELasu, in cattle, wild game and wild tsetse flies. In a herd of cattle belonging 

 to the Mvera Mission, which lies about two miles to the east, 32 per cent, 

 were found to be infected by this disease. The mission station is built near 

 the edge of the "fly-country," and there is little doubt that the cattle were at 

 times exposed to the bite of the " fly." After the disease had been discovered 

 to be present in the herd the animals were prevented from grazing in the 

 direction of the danger, and since then no new cases have occurred. It is 

 also the species of trypanosome most commonly found in the blood of the 

 wild game in this district, and consequently the tsetse fly is found infected 

 with it more frequently than with any other. It is one of the most important 

 trypanosome diseases of domestic animals in Central Africa, as it affects 

 them all — horses, cattle, goats, sheep, pigs, and dogs. 



Morphology of Trypanosoma pecorum. 



The description already given* of this species of trypanosome as regards its 

 movements and appearance when alive, its shape, contents of cell, etc., when 

 * ' Roy. Soc. Proc.,' 1910, B, vol. 82, p. 468. 

 VOL. LXXXVII. — B. B 



