32 



Sir D. Bruce and others. Trypanosome 



Chart 2. — Curve representing the Distribution, by Percentages, in respect to Length, of 

 500 Individuals of the Trypanosome of the Mzimba Strain, taken from Eats alone. 



MCCTOTVS 



1} 



fi- 



ts 



16 



'? 



18 



'9 



20 



Z! 



zz 



ZJ 



24 



IS 



ze 





za 



29 



30 



31 



3Z 



33 



Sf 





37] 38 









































































































































































f\ 























































\ 





















































V 





















































\ 





















































-\ 























































r 















































4 







V 











































































































\ 













































* 











V 











































































































\ 















































































































































i 







































































































I 



























K 



























*\ 



























-o— 

















The similarity in the curve of the Mzimba strain and the curve of the 

 Wild-game strain* is remarkable, and there can be little doubt that the same 

 trypanosome is being dealt with. This is what might be expected, seeing 

 there is probably only one animal between the wild G. morsitans and the 

 experimental animal in both cases. 



Table IY. — Measurements giving the Average Distance from the Posterior 

 Extremity to Micronucleus, Micronucleus to Nucleus, etc., of 1000 Indi- 

 viduals of the Trypanosome of the Mzimba Strain. 



Posterior extremity 

 to micronucleus. 



Micronucleus to 

 nucleus. 



Diameter of 

 nucleus.f 



Nucleus to anterior 

 extremity. 



Flagellum. 



Short and Stumpy (16-21 microns), 608 Individuals. 

 1-2 | 4-4 | 2-9 | 10-6 



0-4 



Intermediate (22-24 microns), 247 Individuals. 

 1-5 | 5-3 | 3-0 | 10-4 



2-6 



Long 



1-8 



and Slender (25-32 microns), 145 Individuals. 



5-8 3 10-9 



5-5 



Average 1 '5 



5-2 



3 



10 -6 



2-8 



f xnese meusureiiieiits cwc xiiau.c <*i.ujjg i^g 1*^*0 ^ ..j^ — ~ — ~— ~ -~ — — 



oval nucleus is lying transversely, the measurement given will not represent the greatest length 

 of the nucleus. 



* 1 Eoy. Soc. Proc.,' B, vol. 86, p. 394. 



