1.912.] The Measurement of Trypanosoma rhodesiense. 231 



Table VII. 





T. rhodesiense (Eat B 16). 



fx. 



per cent. 



13—21 



10 to 95 



22—24 



5 to 40 



25—39 



to 85 



Thus it is clear that extreme variations in the length of the trypanosome 

 are found in the different hosts, and on different days of infection in the 

 same host, on examining the trypanosome in samples of 20. 



If, again, a study of the distribution of 1000 T. gambiense, 1000 T. rho- 

 desiense, and 1000 T. brucei* is made by the more usual method of quartiles 

 or octiles, the following results are obtained : — • 



Table VIII. 





125th. 



250th. 



375th. 



500th. 



625th. 



750th. 



875th. 







/i. 



fi. 









/*■ 





18 



19 



20 



21 



23 



25 



27 



T. rhodesiense 



18 



20 



22 



24 



26 



27 



29 





18 



20 



22 



24 



25 



27 



29 



From this table it is seen that the measurements of T. rhodesiense and 

 T. hrucei are almost the same, but that they again differ from those of 

 T. gambiense. Our results are represented graphically in Chart 1. 





Macrons 



12 



13 



14 



ts\l6 



n 



18 



•9 



20 













26 



2J 





ZS 1-30 



31 





33 



34 



35 



36 









10 



9 



« 8 



?? 

 *> 6 



» 5 

 2 + 



2 

 t 



o 



















































































































































































































































- 



V 





















































































































































































































































































































































































Chart 1. — Curve representing distribution, by percentages in respect to length, of 

 1000 specimens of T. rhodesiense, from various hosts. 



* The figures for T, brucei have been deduced as accurately as possible from Bruce's 

 curve (1911). 



