502 



Sir D. Bruce and others. Description of a 



from the rat. It is very similar to some of the curves taken from the 

 ISTyasaland human strain :* compare Strains II and V. But, on the other 

 hand, it is very unlike some of the others, as for example Strains I and II. 



Chart 4. — Curve representing the Distribution, by Percentages, in respect to Length, of 

 500 Individuals of T. brucei, Zululand Strain, 1913, taken on nine consecutive days 

 from Eat 1829. 



23 

 22 

 21 

 20 

 19 

 18 

 17 

 16 

 15 

 14 



o13 



o> 



312 

 |l1 

 o10 

 *9 

 8 

 7 

 6 

 5 

 4 

 3 

 2 

 1 



Microns 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 1 24 



25 



26 



27 



28 



29 



30 









































































































































































































































































































































































































































































































































\ 

















































































































































































































































































































































This is rather a peculiar curve, but is not unlike curves obtained in a 

 similar way from the trypanosome causing disease in man in Nyasaland, as 



the following chart will show : — 



* 'Eoy. Soc. Proc.,' B, vol. 86, pp. 285-302. 



