290 Sir D. Bruce and others. Trypanosome [Feb. 8, 



nuclears in 1000 short and stumpy forms in 10 specimens of a single rat's 

 blood taken, as near as possible, on 10 consecutive days. 



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

 and Stumpy Varieties of the Trypanosome of Strain II, E . 



Date. 



Experiment 

 No. 



Animal. 



Percentage among short 

 and stumpy forms. 



1912. 











728 



Eat 



10 



26 



728 





17 



„ 27 



728 



» 



3 



„ 29 



728 





9 



July 1 



728 



>> 



5 



„ 2 



728 



ii 



5 



„ 3 



728 



ji 



9 



4 



728 





3 



„ 5 



728 





18 



„ 6 



728 



i) 



14 





9-3 



In regard to breadth, shape, contents of cell, nucleus, micronucleus, 

 undulating membrane and flagellum, it is not proposed to describe these 

 characters separately for each strain, as was done in Strain I. Suffice it 

 to say that no difference can be made out in regard to these particulars 

 on comparing the five strains. The same posterior-nuclear and blunt-ended 

 forms are present in all. 



III. Morphology of Strain III, CMtuluka, 



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

 in the goat, monkey, dog and rat, 1500 trypanosomes in all, and also the 

 length of the longest and shortest : — 



Table V. — Measurements of the Length of the Trypanosome of Strain III, 



Chituluka. 



Date. 



Method of fixing. 



Method of 

 staining. 



In microns. 



Average 

 length. 



Maximum 

 length. 



Minimum 

 length. 



1912 



Osmic acid 



Giemsa 



26-1 



38 -0 



15 -0 



The average length of the trypanosome of Strain III, in different species 

 of animals, is as follows : — 



