1910.] 



Diseases of Domestic Animals in Uganda. 



479 



several fields of the microscope. Whether this was due to the difference in 

 the composition of the blood medium, or to the higher temperature at 

 Mpumu, it is impossible at present to say. 



By comparing the coloured plates of this trypanosome and the one from 

 Zanzibar, a certain resemblance will be seen, but how far this should be 

 taken as a factor in the diagnosis is difficult to say. 



Conclusions. 



1. Trypanosoma pecoincm is an important trypanosome disease of domestic 

 animals in Uganda. 



2. It is similar in morphology, action on animals, and cultural characters, 

 to the Trypanosoma dimorphon described by Laveran and Mesnil, and to 

 Dr. Edington's trypanosome from Zanzibar, described in the ' Proceedings,'* 

 except that Trypanosoma j^ecorum is not pathogenic to guinea-pigs. 



3. The carrier is unknown, but is probably a Tahanus, and not Stomoxys. 



DESCEIPTION OF PLATES. 

 Plate 11. 



This plate represents the general appearance of Trypanosoma pecorum in stained 

 preparations. Note the rounded, blunt, or angular shape of the posterior extremity ; 

 the small, round micronucleus and vacuole placed near this end ; the oval nucleus ; and 

 the absence of a free flagellum, except in dividing forms. Stained Giemsa, x 2000. 



Plate 12. 



Pig. 1. — An aggregation, or clump, of Trypanosoma peconnn after 24 hours' growth in 



blood-agar. Stained Giemsa, x 2000. 

 Fig. 2. — The same after 48 hours. Stained Giemsa, x 2000. 



Figs. 3, 4, and 5. — Trypanosoma pecorum after 3 days' growth. Stained Giemsa, x 2000. 

 Figs. 6 and 7. — Trypanosoma pecorum after 4 days' growth. Stained Giemsa, x 2000. 

 Figs. 8 and 9. — Trypanosoma pecorum after 8 days' growth. Stained Giemsa, x 2000. 

 Figs. 10, 11, and 12. — Trypanosoma pecorum after 10 days' growth. Stained Giemsa 

 X 2000. 



* B, vol. 81, p. 14. 



