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- 



