1913.] 



causing Disease in Man in Nyasaland. 



293 



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

 500 Individuals of the Trypanosome of Strain III, Chituluka, taken on nine consecu- 

 tive days from Eat 953. 



Microns 



13 





15 16 



17 1 is 



19 



20 



21 



22 



23 



24 



is 



26 



27 



23 



23 



.0 



31 



12 



33 



34 



3o 



36 



37 



3 8 







... 























































































































































































f 































































































































































































s, 





































































































f 







































































































i 















































These last two curves from different rats also closely resemble each other. 

 It is curious and striking that the same strain of trypanosome growing in 

 two different animals should show this remarkable similarity. 



Table VIII. — Percentage of Posterior-Nuclear Forms found among the Short 

 and Stumpy Varieties of the Trypanosome of Strain III, Chituluka. 



Date. 



Experiment 

 No. 



Animal. 



Percentage among short 

 and stumpy forms. 



1912. 









August 2 



953 



Eat 



4 



3 



953 





6 



„ 6 



953 





3 





953 





8 



8 



953 





6 



„ 9 



953 





13 



„ 10 



953 





32 





10-3 



IV. Morphology of Strain IV, Chipochola. 

 The following table gives the average length of this trypanosome as found 

 in goats, monkeys, dogs and rats, 1000 trypanosomes in all, and also the 



length of the longest and shortest : — 



