1910.] Diseases of Domestic Animals in Uganda. 471 



Table I. — Trypanosoma pecomm. 



No. of 

 experiment. 



Animal. 



Day of 

 disease. 



Method of 

 fixing and 

 staining. 



Average 

 length. 



In microns. 



3(Iaximiim 

 length. 



ATinTTn^iTn 



length. 



0^ 



Us 





Osmic vapour 



1 1 •'7 



14 u 



lU u 









and Giemsa 









OUO 





.1 o 





1 o .o 

 U o 



lo U 



lU u 





Slieep 





51 



13 -2 



15 -0 



11 0 



593 



50 





14 "5 



17 '0 



10 '0 



44 



Monkey 



31 



)> 



12 -2 



14-0 



10 -0 



559 





14 



>j 



12 -7 



16 -0 



11 -0 



461 



Dog 



44 



)i 



15 -3 



18 -0 



13 0 



543 





10 





14 -3 



16 -0 



11 0 



1406 



Rat 



31 



J) 



13 -7 



16 -0 



11 -0 



551 



19 



)> 



12 -6 



IS -0 



8-0 



626 









12 -8 



15 -0 



10 0 



398 



Mouse 



28 





14 -6 



16-0 



13 -0 



398 





36 



)> 



13 1 



17 -0 



10 -0 



Average 



13-3 



16 -0 



10 -6 



Micronucleus. — Small and round, and situated near to, but not at, the 

 posterior extremity. 



U nchdatinj Membrane. — Is simple, but fairly well developed. 



Flagcllum. — There is no free flagellum. In very rare cases, where there is 

 an appearance of a free flagellum, the trypanosome will be found to be 

 dividing. 



As it is difficult to gain an idea of the general appearance of a 

 trypanosome, a series of coloured drawings by Lady Bruce, E.E.C., is 

 also given to supplement the written description (Plate 11). The trypano- 

 somes have been stained by Giemsa's method, and drawn at a magnification 

 of 2000. By referring to them, the shape, disposition of the micronucleus, 

 and other parts of the structure of Trypanosoma pecorum, will be more readily 

 understood. 



As will be seen from this tabulated statement, the disease set up in 

 domestic animals by Trypa7Wsoma pecorum is a serious and fatal one. 



Cattle, goats, sheep, monkeys, dogs, rats, and mice are susceptible. 

 Guinea-pigs, on the other hand, are refractory. Horses, mules, donkeys, and 

 rabbits were not available at Mpumu, so that, unfortunately, it is not 

 possible to say whether they are inoculable or not. In regard to guinea- 

 pigs it would be interesting to know whether a series of inoculations into 

 rats or rabbits would make the Trypanosoma pecorum also pathogenic for 

 them. 



