causing Disease in Man in Nyasaland . 



203 



Chart 8. — Curve representing the Distribution, by Percentages, in respect to Length, of 

 500 Individuals of the Trypanosome of Strain X, Dongolosi, taken on nine consecu- 

 tive days from Rat 2489, which had been infected by a single trypanosome of the 

 long and slender type. 



13 







17 



r 



•Micron 



21 |22jZ3 24 |25 



5 



f> 27 ':o 



30 j 31 \yz 



33 |'J4 j 35 



36 | 37 | 36 



... 





1 









































































































































































































































































































































































































































































































































































































































































— 



















































• 





















































































\ 





































































1 











































































1 









\ 































Comparison of the Human Strains VI to X. 



Table XXIT. — Measurements of the Length of the Trypanosomes of the 

 Five Human Strains VI to X. The trypanosomes have been taken from 

 the rat alone. 



Date. 



Strain. 



Name. 



Number of 

 trypanosomes 

 measured. 



Average 

 length. 



In microns. 



Maximum 

 length. 



Minimum 

 length. 







1913 



VI 



Manakumpara 



500 



21 -7 



32 -0 



15-0 



1913 



VII 



Yoramu 



500 



22 -5 



34 -0 



16 



1913 



VIII 



Mekka 



500 



22 -4 



33 -0 



16 



1913 



IX 



Mkanthama ... 



500 



21 -2 



33 -0 



14 -0 





X 



Dongolosi 



1 



500 



23 -5 



32 -0 



17 -0 





- 



1 





22 -3 



34 



14 -0 



The average length of Strains I to A r , taken from rats alone, is 24 - 2 microns ; 

 maximum 38, minimum 15. This gives an average for the 10 strains of 

 23 - 2 microns ; maximum 38, minimum 14. 



