Strain of T. brucei from Zululand. 499 



The average length of T. brucei, Zululand strain, 1913, in the monkey, dog, 

 juinea-pig, and rat, taken from Table I, is as follows : — 



Table II. — Average Length of T. brucei, Zululand Strain, 1913. 



Species of animal. 



Number of 

 trypanosomes 

 measured. 



In microns. 



Average 

 length. 



Maximum 

 length. 



Minimum 

 length. 



Dog 



Guinea-pig 



Eat 



160 

 260 

 30 

 500 



21 -2 



21 -5 



22 -9 

 20 -8 



31 -0 



32 -0 

 35 -0 

 28 -0 



12-0 

 16-0 

 17 -0 

 17 -0 



The above table shows that a good deal of difference in growth takes place 

 in different animals. Compare, for example, the guinea-pig with the rat : the 

 former with a maximum of 35 microns, the latter with a maximum of only 

 28 microns. 



The next table gives in detail the distribution in respect to length of 

 1000 trypanosomes. The Commission feel hardly justified in taking up space 

 for this purpose, but it is thought that perhaps in some unknown way these 

 figures may be of use to the statistician. 



Chart 3. — Curve representing the Distribution, by Percentages, in respect to Length, of 

 1000 Individuals of T. brucei, Zululand Strain, 1913. 



18 

 17 

 16 

 15 

 14 

 13 

 12 

 11 

 10 

 S 9 



3 8 



S7 



o 



% 6 

 * 5 

 4 



3 

 2 

 1 



Microns 



12 



15 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



27 



28 



28 



30 



31 



32 



33 



34 



35 

















































































































































































































f 





































































































































































































— — ' 

























































































\ 











I 



































































































































































































































































































































J 

























































































This curve is made up of measurements from 160 specimens of trypanosomes 

 taken from the monkey, 260 from the dog, 80 from the guinea-pig, and 500 



