204 



Sir D. Bruce and others. Trypanosome 



Table XXIII. — Distribution in respect to Length of 2500 Individuals of the Human 

 Strains VI to X. The trypanosomes have been taken from the rat alone. 























In 



microns. 





















14. 



15. 



16. 



17. 



18. 



19. 



20. 



21. 



22. 



23. 



24. 



25. 



26. 



27. 



28. 



29. 



30. 



31. 



32. 



33. 



34. 



Totals ... 



1 



12 



31 



97 



187 



260 



286 



283 



262 



233 



205 



173 



140 



109 



85 



57 



45 



18 



11 



4 



1 



Per- 



0-05 



0-5 



1 -2 



3 -9 



7-4 



10-4 



11 -4 



11 -3 



10 -4 



9-3 



8-2 



6-9 



5-8 



4-4 



3-4 



2 -3 



1 -8 



0-7 



'4 



0-2 



-05 



centages 













































Chart 9. — Curve representing the Distribution, by Percentages, in respect to Length, of 

 2500 Individuals of the Human Strains VI to X of the Trypanosome causing Disease 

 in Man in Nyasaland, taken from the Eat alone. 



This curve is very similar to that made from Strains I to V,* except that it 

 lies a little to the shorter side. 



Table XXIV. — Comparison of the Percentages of Posterior-nuclear Forms found 

 among the Short and Stumpy Varieties of the Human Strains VI to X. 



Date. 



Experiment 

 No. 



Strain. • 



Animal. 



Percentage among short 

 and stumpy forms. 



1913 

 1913 

 1913 

 1913 

 1913 



2239 

 2236 

 2300 

 2386 

 2437 



VI, Manakumpara 



VII, Yoramu 



VIII, Mekka 



Eat 



14 -3 

 13 -4 

 24-2 

 28-6 



5-0 



Average 



17-1 



The average percentage of the Strains I to V was 17'8 microns. 



* 'Roy. Soc. Proc.,' B, vol. 86, p. 301 (1913). 



