34 Trypanosome causing Disease in Man in Nyasalo/ad. 



Micronucleus. — Situated, on an average, 1/8 microns from the posterior 

 extremity in the long and slender, 1-5 in the intermediate, and 1'2 in the 

 short and stumpy. 



Undulating Membrane. — Well developed. 



Flagellum. — The flagellum in the short and stumpy averages - 4 micron 

 (maximum 4, minimum 02), in the intermediate 2 - 6 (maximum 6, minimum 1) 

 and in the long and slender 5 - 5 (maximum 10, minimum 2). Total average 

 2 - 8 (maximum 10, minimum 1). 



Table VI. — Number of Flagellated and Xon-nagellated Forms found among 

 1000 Trypanosomas of the Mzimba Strain. 



Short and stumpy. 



Intermediate. 



Long and slender. 



Length, 

 microns. 



Non- 

 flagellated. 



ij 



o 



■43 



to 



tn 



a 



- 9 



Non- 

 flagellated. 



13 



o 



js 



"o 

 £0 



£ 



Length, 

 microns. 



t; 



• 4a 



5 :5 

 £; 3 



" tL 

 e3 

 -= 



43 



~c 



16 



8 







22 



34 



75 



25 







36 



17 



27 







23 



12 



60 



26 







32 



18 



73 



6 



24 



5 



61 



27 







24 



19 



154 



21 









28 







22 



20 



153 



27 









29 







16 



21 



94 



45 









30 







7 















31 







4 















32 







4 



Totals 



509 



99 





51 



196 









145 



If the trypanosomes are divided into non-flagellar and flagellar, there are 

 56 per cent, of the former and 44 per cent, of the latter. 



If we divide the 1000 Mzimba trypanosomes by length into short and 

 stumpy (16 to 21 microns), intermediate (22 to 24 microns), and long and 

 slender (25 to 32 microns), the percentages are 60'8, 24 - 7, and 14"4 

 respectively. 



Conclusions. 



1. The trypanosome of the Mzimba strain is the same species as that 

 occurring in the wild game inhabiting the Proclaimed Area, Xyasaland. 



2. It has already been concluded that this species is T. brucei vel 

 rhodesiense. 



3. Hence it would appear that wild G. morsitans occurring in a district 

 100 miles north of the Proclaimed Area are infected with the trypanosome 

 which causes the Human trypanosome disease of Xyasaland. 



