4 



The Transmission of Trypanosoma nanum (Laveran). 

 By Dr. H. L. Duke. 



(Communicated by Sir J. Eose Bradford, Sec. B.S., being a Beport to the Sleeping 

 Sickness Commission. Beceived December 19, 1911, — Bead February 29, 1912.) 



On March 17, 1911, Dr. van Someren kindly sent a goat to Mpumu, 

 which he had inoculated with a trypanosonie found by him in cattle in the 

 neighbourhood of Sebwe Biver. 



This trypanosome, he averred, caused a fatal disease. On further investiga- 

 tion, it proved to be identical with Trypanosoma nanum, both as regards 

 morphology and animal reactions, and thus confirms the opinion of the 

 1908-10 Commission, namely, that this trypanosome is a Uganda species. 



Although experiments are still in progress, sufficiently important results 

 have already been obtained to warrant their being recorded, adding, as they 

 do, one more to the long list of trypanosomes carried by Glossina palpalis. 



Morphology. 

 A. Living, Unstained. 

 Corresponds closely to Trypanosoma pccorum. The tendency to stick to 

 adjacent corpuscles is very marked. 



B. Fixed and Stained {Osmic and Giemsa). 



As regards general structure, agrees with the description given by former 

 workers in this laboratory. No trace of a free flagellum is visible. 



Few observations are available as regards length, owing to the limited 

 number of susceptible animals inoculated. 



The following table gives maximum, minimum, and average measurements 

 of the trypanosome in ox and sheep : — 



Experiment 

 No. 



Animal. 



Fixation. 



Stain. 





Maximum. 



Minimum. 



Average. 



59 



Sheep 



Osmic and 



G-iemsa 



16 



12 -00 



14 -5 





abs. alcohol. 











232 



Ox 







15-5 



11-00 



13 -5 



