2 Sir D. Bruce and others. Trypanosome 



stained, are applicable to the species as it occurs in Nyasaland and need not 

 be repeated. 



I. The Mvera Cattle Strain. 



Length. — The following table gives the length of this trypanosome as 

 found in the donkey, ox, goat, dog, and rat — 500 trypanosomes in all : — 



Table I. — Measurements of the Length of the Trypanosome of the Mvera 



Cattle Strain. 



Date. 



No. 

 of 

 expt. 



A w t yii al . 



Method of 

 fixing. 



• 



Method of 

 staining. 



Average 

 length. 



In micron.; 



Maximum 

 length. 



Minimum 

 length. 



1912. 

















Jan. ... 



i u 



Donkey 



" 



Osrmc acid 



Oriemsa 



1 4 ± 



16 *0 



11 "0 



March 15... 



9Q1 



zy i 



)> 





1 9 «0 



i r *n 



xi> u 



] 1 '0 



April 16... 



445 



» 



») 







IO u 



12 '0 



„ 18... 



291 









,, 



13 -0 



15 -o 



12-0 





102 



Ox 







J4 "8 



17 "0 



13 -0 



„ 17... 



103 







j» 



13 "9 



16-0 



12 -0 



Feb. 9... 



100 







>> 



13 -0 



15 -0 ' 



11 



9... 



103 









14 -6 



17-0 



11 



9... 



103 





i) 





14 '5 



17 -0 



12 



„ 20... 



104 









14-0 



16 -0 



12 



„ 26... 



100 









14 -4 



16 -0 



11 -o 



March 1 . . . 



227 







J. 



14 -0 



16 -0 



12 



„ I- 



228 









14 -5 



18 -0 



11 



Feb. 26... 



208 



Goat 



)) 





13 2 



15 -0 



9-0 



„ 29... 



178 







?. 



13 -2 



15 



10 -0 



March 11... 



206 











14 & 



17-0 



11 -o 



„ 11... 



208 







). 



14-6 



16-0 



12 -0 



May 20... 



]99 









13 3 



15 



12 -0 



Feb. 15... 



16 



Dog 



)) 





13 -8 



16 -0 



11-0 



„ 26... 



212 







14-4 



16-0 



13 



„ 26... 



214 







J? 



133 



16-0 



11 -o 



„ 26... 



217 









13 -5 



15 -0 



12 -0 



March 4... 



218 









13 -8 



16 -0 



12 -0 



„ 14... 



223 



Eat 







14 -8 



16-0 



13 -0 



„ 18... 



223 







>) 



14 -7 



16 -0 



13-0 













14 -0 



18 -0 



9-0 



The average length of the trypanosome of the Mvera Cattle strain, in 

 different species of animals, is as follows (Table II) : — 



Eats were, as a rule, immune to this strain, but on one occasion, in a case 

 of mixed infection, it was found along with T. brncei. It was thought 

 that the presence of T. brucei may have broken down the rat's immunity 

 to T. pecorum. 



