20 Col. Sir D. Bruce and others. Trypanosome [July 22, 
breadth.—Varies between 2 and 3 microns. 
Shape-—This species can be recognised with certainty by its shape alone. 
The body of the creature lies mostly posterior to the nucleus, and this part is 
broad and swollen and filled with beautifully clear protoplasm, in which a 
delicate alveolar structure can be made out. The body narrows at the nucleus 
and tapers off rapidly to the anterior extremity (Plates 3 and 4). 
Contents of Cell—tClear, with a delicate alveolar structure, and now and 
then a chromatin-staining granule, especially in the narrow anterior part. 
Nucleus—Long and oval, often diffuse, situated towards the anterior 
extremity, and in a narrowed or waist-like part of the trypanosome. 
Micronucleus.—Large, round and terminal, or sub-terminal. 
Undulating Membrane.—Narrow, simple, straight, and little in evidence. 
Flagellum.—There is a well-marked flagellum, the free part varying from 
3 to 6 microns in length (Plates 5 and 4). 
COMPARISON OF TRYPANOSOMA VIVAX, UGANDA, 1909, with TRYPANOSOMA 
VIVAX, TOGOLAND, 1903. 
Thanks to the courtesy of the Director of the Hamburg Institute of Tropical 
Medicine, through Dr. Fiilleborn, the Commission are enabled to compare the 
Uganda strain with the original preparations made by Ziemann in 1903. 
Table I1J.—Measurements of the Original Strain of Trypanosoma vivax 
(Ziemann), 1903. 
In microns. 
. Method of fixing 
sna, and staining. | 
Average length. | Maximum length. | Minimum length. | 
| 
Ox ? 24 °8 26 -0 23 -0 | 
5S 2 265 31-0 23-0 | 
Sheep ? 21 °4 23 °O 18 ‘0 | 
. P 221 25 *0 20-0 
| | 
Average......| 23 °7 31 °0 | 18 °0 | 
The trypanosomes found in the blood of this sheep were shorter, narrower, 
and have a more pointed posterior extremity that in the type described. 
Whether this is the rule or only exceptional it is impossible with our scanty 
material to say. 
