1910. | Diseases of Domestic Animals in Uganda. 9 
Micronucleus—Small and round, situated, on an average, 2:1 microns from 
the posterior extremity in the long and slender forms, 1°4 microns in the 
intermediate, and 1:1 microns in the short and stumpy. 
Undulating Membrane.—This is well developed in this species and thrown 
into many folds and undulations. In this it differs markedly from 
Trypanosoma vivax. 
Hlagellum.—The flagellum in the long and slender forms is free and, on an 
average, 6°4 microns in length. In the short and stumpy forms there is no 
free flagellum. 
COMPARISON OF TRYPANOSOMA BRUCEI, UGANDA, 1909, witrH TRYPANOSOMA 
BRUCEI, ZULULAND, 1894 (see Plate 1). 
When Trypanosoma brucei was discovered in Zululand, in 1894, it was 
naturally thought to be the one and only trypanosome in Africa, and 
a detailed description seemed unnecessary. Now, however, since the 
number of species in Africa has increased to such an alarming extent, it is 
necessary to add to the old description by more detailed measurements. 
Luckily, many of the old Zululand preparations are still extant, so that it 
has been possible to do this. It must, however, be borne in mind that the 
Zululand preparations are some 15 years old, and were stained with carbol- 
fuchsin and not by Giemsa as in the case of the Uganda strain. They may, 
therefore, have shrunk to a greater extent than the more recently stained 
specimens. 
Table [V.—Measurements of the Original Strain of Trypanosoma 
brucei, discovered in Zululand in 1894. 
Trypanosoma brucet, Zululand, 1894. 
In microns. | 
No. Method b 7 : | 
Date. of Animal, of fixing and | 
expt. staining. Average Maximum Minimum 
length. length. length. 
1/11/95 212 Horse | Osmic acid ; carbol- 22 °4, 32 °0 14.°5 
fuchsin 
1/11/95 212 39 fe 5 20 °6 32 °5 14°0 
7/11/95 219 Donkey 3 " 23 °0 35 0 14 °5 
23/11/95 214 Ox ne xe 18 ‘0 25°5 13-0 
A797 | Monkey ° 20° 32-0 15 °0 
6/1/95 190 Dog 3 . 25 °0 35 °0 aye 0) 
10/12/95 | — i a i 24-0 32-0 17-0 
14/1/96 233 a a 3 27 °8 34 °O 18-0 
25/1/96 244, o . R 20 °6 33 ‘0 15 °0 
7/2/96 229 . 55 i, 28 °7 35 °O 19-0 
9/7/97 433 5 5 i 19-7 29 -O a: 
| 228 35-0 13-0 
