40 
Trypanosomiasis of Camels 
Table 7. 
Total 
length 
Length 
without 
flagellum 
Width 
From 
posterior 
end to ble- 
pharoplast 
From ble- 
pharo- 
plast to 
nucleus 
Length of 
nucleus 
From nu¬ 
cleus to 
anterior 
end 
Length of 
free por¬ 
tion of 
flagellum 
in mice 
T. brucei 
20-62 
16-64 
3-05 
1-98 
4-68 
2-76 
6-67 
3-91 
equiperdum (Russian) 20-55 
15-79 
2-84 
1-77 
4-61 
2-41 
6-47 
4-75 
„ (French) 20-05 
15-44 
2-84 
2-13 
4-04 
2-34 
6-24 
4-61 
togolense 
20-44 
14-48 
2-92 
1-42 
4-82 
2-27 
5-25 
5-96 
gambiense 
21-43 
15-90 
2-43 
1-49 
5-18 
2-41 
6-39 
5-53 
hippicum 
20-23 
15-33 
2-84 
1-77 
4-89 
3-19 
5-11 
4-89 
In guinea-pigs 
T. evansi 
22-11 
16-57 
2-69 
1-77 
5-75 
2-84 
5-82 
5-53 
equinum 
22-08 
16-54 
2-69 
7-45 
2-84 
6-24 
5-53 
soudanense 
20-87 
15-12 
2-84 
1-63 
5-25 
2-41. 
5-32 
5-75 
The two species which especially interested us are T. evansi and T. soudan- 
ense ^ and from the above figures it will be seen that the total length of the 
Turkestan parasite exceeds those of the above-named by about 2-73/z, but 
this difference is insufficient to warrant the establishment of a new species. 
There is a well-marked difference from the other pathogenic species. 
Summarising the results of our investigations on this subject the following 
conclusions may be stated: 
(1) The trypanosomes of camels from Bokhara, the Ural and the 
Astrakhan regions present no differences in size. 
(2) By passage through various experimental animals, both small and 
large, the trypanosomes from Turkestan camels do not alter in size. 
(3) The Turkestan camel trypanosome differs in size somewhat from 
other pathogenic trypanosomes and even slightly from the geographically 
related T. evansi of India, but measurements alone are insufficient to dis¬ 
tinguish the two. 
V. VITALITY OF TRYPANOSOMES 1 . 
The vitality of the trypanosomes in vitro was tested at + 17° C. and also 
at 0° C. Blood containing trypanosomes was drawn from a foal and after 
being defibrinated was kept at these two temperatures. 
(1) Preservation on ice. The defibrinated blood was placed on ice on 
October 9. Four days later mobile trypanosomes were still present. On 
October 17, none could be found and the inoculation of the blood into a 
mouse produced no infection. 
(2) Preservation at 17° C. After being kept for seven days no trace of 
trypanosomes could be found and inoculation into a mouse also gave negative 
results. 
1 By W. L. Yakimoff. 
