130 



Sir D. Bruce and others. Trypanosorne 



Conclusions. 



1. The Naturally Infected Dog strain differs slightly from the other strains 

 of the trypanosorne causing disease in man in Nyasaland, in that there are 

 fewer of the posterior-nucleated, blunt-ended forms which are sometimes so 

 much in evidence in the ordinary strains. 



2. Taking into consideration the fact that this strain was only found in 

 three chronically infected dogs, it is concluded that it is an aberrant strain 

 of the widely spread species T. brucei vol rhodesiense, the trypanosorne causing 

 disease in man in Nyasaland. 



DESCRIPTION OF PLATES. 



Trypanosorne of Naturally Infected Dog. 

 Plate 9. — Short and Stumpy, Non-flagellated Forms. 

 Plate 10. — Intermediate Forms. 

 Plate 11. — Long and Slender Forms. 



x 2000. 



The Trypanosorne causing Disease in Man in Nyasaland. 

 The Naturally Infected Dog 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, B.A.M.C. ; and Lady 

 Bruce, B.B.C. (Scientific Commission of the Boyal Society, Nyasaland, 

 1912-14.) 



(Received April 16 ,— Bead June 25, 1914.) 

 Introduction. 



In a previous paper* the morphology of the three strains of this trypano- 

 sorne, from three naturally infected dogs, was described, and the strains 

 compared with each other and with the Human strain. 



This paper describes the action on various animals of the three strains and 

 tabulates a comparison with the Human strain. 



The first strain— Dog 48 — was studied in a fairly large number of animals, 

 but the second and third in few, as both were accidentally lost. 



* ' Roy. Soc. Proc.,' B, vol. 88, p. Ill (1914). 



