Trypanosomas in Blood of Wild Animals in Nyasaland. 269 



having been favoured of late years but only on account of its more perennial 

 character. 



We have to thank Messrs. Temperley and Co. of Hexham and Newcastle-on- 

 Tyne for placing seed of the Wild White variety of Clover at our disposal and 

 also Prof. Gilchrist, Mr. C. T. Gimingham, Dr. Russell, Prof. Somerville and 

 Dr. J. Voelcker for the trouble they have taken in assisting us to procure 

 specimens. 



Hie Trypanosomes found in the Blood of Wild Animals Living in 

 the Sleeping -Sickness Area, Nyasaland. 



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

 Harvey and A. E. Hamerton, D.S.O., R.A.M.C. ; Dr. J. B. Davey, 

 Nyasaland Medical Staff;* and Lady Bruce, R.R.C. 



(Received January 13, — Read March 6, 1913.) 

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



Introduction. 



The chief object of this Commission in coming to Nyasaland was to 

 inquire into the relation of the African fauna to the maintenance and spread 

 of trypanosome disease. 



The Commission arrived at their camp on Kasu Hill on January 12, 1912. 

 As this was the rainy season the low country was covered with dense 

 vegetation and much of it under water. Nothing could therefore be done in 

 the study of the fauna until about the beginning of June, when the dry 

 season was well established. 



The camp at Kasu is situated on one of the hills (lat. 13° 40' S., long. 

 34° 12' E.) which rise on the western edge of the flat country adjoining 

 Lake Nyasa. This low-lying lake-coast plain looks quite flat when viewed 

 from the camp, and extends from the lake shore some 20 miles inland. The 

 camp lies about 10 miles from the edge of this low country, and, therefore, 

 some 30 miles from the lake. This plain is covered with thorn scrub, except 

 near the lake, where there are large grassy plains, or " dambos,"' clotted over 

 with palm trees. The thorn-scrub is the home of the tsetse-fly and also of 

 numerous wild animals. 



* Dr. Davey resigned his membership of the Commission in October, before the 

 completion of the work here recorded. 



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