REPORT OF TRAVELLING PATHOLOGIST AND PROTOZOOLOGIST 
137 
These remaiks have reference to I'vypanoso'inci pecciu/lL It is interesting to renieniber that 
positive results have been obtained by Eoubaud and Dutton, Todd and Hanington working 
with Trypo/nosovi(i‘ dwwi'phon and Crlossinci pulpalis. TTypanosovid ticinuvi, which occurs 
regularly in Wau and is responsible for the death of large numbers of donkeys, belongs to 
another category. In its transmission Glossina may have no share, as the trypanosome is 
found in districts where the fly is never seen. 
Trypanosoma nanum was named and described by Laveran from films sent to him by 
Dr. Balfour in 1905. The appearances of this trypanosome in the fresh blood have been well 
described by Dr. Balfour in the last volume of the Eeports, and the stained specimens by 
Laveian. Fiom examination of a large number of specimens, I should say there are two 
main types of this trypanosome ; 
1. Forms measuring from 10 to 15/i with no free flagellum, undulating membrane straight 
and difficult to bring out in stained specimens—resemble tadpole forms of T. dimorphon. 
2. Forms measuring about 20//, 5// of which are taken up by the. free flagellum. 
Between these two tj-pes are intermediate forms. All these are shown at Fig. 39. 
These findings correspond closely 
with the descriptions of this try¬ 
panosome by Dr. Balfour and Prof. 
Laveran. 
I came across this trypanosome 
in cattle on the Sobat at the 
American Mission Station, in cattle 
at Wau, in the Bahr-El-Ghazal 
Province, and at Bor in a dying 
cow which had left Uganda two days 
before. The condition of this cow 
does not admit of the possibility of 
its having been infected after enter¬ 
ing the Sudan. Trypanosoma nanum 
has, therefore, a wide distribution 
through the Southern Sudan and even into Uganda. Further observation will probably 
extend the limits of its distribution. 
A trypanosome resembling T. nanum was found by Dr. Balfour in mules, and mentioned 
by him in the Second Eeport {page 172). This trypanosome I found in mules at Wau, 
and also in donkeys at the same place. I think there can be little doubt that this 
trypanosome is identical with T. namim of cattle. The disease produced in cattle and in the 
donkeys and mules is the same—viz., a slow wasting, ultimately ending in death.' The 
trypanosomes are never very numerous in the blood, there being rarely as many as one 
trypanosome to every three or four fields of the microscope. More usually it takes several 
minutes’ search on a stained film to find a single example. In all these animals the trypanosomes 
have the same characters, and further inoculation of rats from either cattle or donkeys 
is practically always followed by negative results. Fifteen rats were inoculated either from 
cattle or donkeys infected with the small trypanosome, and in only one case (from a cow) was 
an infection produced, and that after sixteen days’ incubation period. This rat unfortunately 
died unexpectedly, and the strain was lost. From mules rat inoculations were not made, but 
Dr. Balfour has been able to carry on a strain from a mule by inoculation in gerbils. From 
a heifer suffering from this disease on the Sobat I inoculated two young dogs. One of 
T. nariuvi of 
cattle 
Form with free 
flagellum 
The short 
trypanosome 
of mules 
probably 
T. nafium 
Recovery can certainly take place in the case of cattle.—A.B. 
