GREAT HERDS OF WILD GAME 
57 
a common malady among monkeys. In one of the 
rooms of the laboratory there were natives holding 
little cages of tsetse flies against the monkeys, 
which were pinioned to the floor by the natives. The 
screened cages were held close to the stomach of 
the helpless monkey, and little apertures in the 
screen permitted the fly to settle upon and bite the 
animal. 
There are certain wide belts of land in Africa 
called the “tsetse fly belts,” where horses, mules and 
cattle can not live. These districts have been known 
for a number of years, long before the sleeping 
sickness became known. In the case of animals, the 
danger could be minimized by keeping the animals 
out of those belts, but in the case of humans the 
same can not be done. One infected native from a 
sleeping sickness district can carry the disease from 
one end of the country to the other, and when once 
it breaks out the newly infected district is doomed. 
Consequently the British authorities are greatly 
alarmed, for by means of this deadly fly the whole 
population of East Africa might be wiped out if 
no remedy is discovered. It has not yet been abso¬ 
lutely proven that East Africa is a “white man’s 
country,” and in the end it may be necessary for him 
to give up hope of making it more than a place of 
temporary residence and exploration. 
We were also shown some ticks. They are the 
pests of Africa. They exist nearly every place and 
carry a particularly malicious germ that gives one 
“tick fever.” It is not a deadly fever, but it is recur- 
