2 Col. Sir D. Bruce and others. Trypanosome [July 15, 
in the coloured plate,* shows it to be similar to 7rypanosoma brucei, so that 
in all likelihood it was either this species or the tlosely related Trypanosoma 
evanst. As camels were infected, it was more probably the latter. 
In regard to the third kind of trypanosome found in 1903, and referred 
to as the “ Mule trypanosome,” no opinion can, at present, be given. 
As to the remaining trypanosome seen in 1903, and known as “ Pordage’s 
ox trypanosome,’t an examination of the old specimens at once disclosed 
its identity. Itis 7rypanosoma vivax (Ziemann); and this accounts for the 
fact that the blood of the ox injected into a monkey and a dog had no effect, 
these animals being refractory to Trypanosoma vivax. 
MorPHOLoGY OF TRYPANOSOMA BRUCEI, UGANDA, 1909. 
This species is interesting on account of its well-marked dimorphism, in 
which Z7rypanosoma gambiense resembles it. There are two varieties—the 
long and slender with free flagellum, and the short and stumpy without free 
flagellum. The shortest are only 13, and the longest 35 microns in length. 
In this paper the long and slender are considered to be those which 
measure from 25 to 85 microns; the short and stumpy from 13 to 
21 microns. Those trypanosomes which measure 22, 23 or 24 microns are 
called intermediate. The general character of these forms may be given, 
shortly, as follows :—The long and slender have a narrow extended posterior 
extremity, an elongated oval nucleus, a well-developed undulating membrane 
thrown into many waves, folds or plications, and a long free flagellum (see 
Plate 2, figs. 1 to 5). The short and stumpy, on the other hand, have a 
rounded posterior extremity, somewhat like the head of a turtle, a round or 
oval nucleus lying transversely to the long axis of the trypanosome, a well- 
developed undulating membrane thrown into bold folds, and no free 
flagellum (see Plate 2, figs. 11 to 16). The intermediate have a short free 
flagellum, a posterior extremity resembling that of the short and stumpy 
form but narrower, an oval nucleus, and a well-developed undulating 
membrane (see Plate 2, figs. 6 to 10). 
A. LInving, Unstarned. 
No observations were made in Uganda on this species of trypanosome in 
the living, unstained condition. 
B. Fixed and Stained. 
The blood films were fixed, stained, and measured as described in the 
‘ Proceedings.’ , 
* Ibid., No. VI, plate 2, p. 113. 
+ Ibid., No. IV, p. 48. 
{ B, 1909, vol. 81, pp. 16 and 17. 
