22 THE QUESTION OF THE RELATION OF 
(or some other fruit which could represent 4 plant juices ’), which 
must of course be brought up to blood temperature. The 
skin might then be pressed against the gauze of a tsetse-fly 
cage, to determine whether blood-sucking flies can subsist upon 
such food as honey or plant juices. 
The sixth question is a difficult one, but will be greatly 
simplified when an answer is obtained to the fourth. 
I am willing to admit that it is highly probable that human 
trypanosomes will eventually be found in the blood of antelope, 
but it is to be sincerely hoped that it will not tempt the discoverer 
to make an incautious and sensational declaration of the fact 
which can be interpreted by the public as indicating that 
at last the whole problem is solved. The public will be only 
too ready to take this opportunity to attack the policy of 
caution which has been wisely adopted in the past, and will 
clamour for the immediate extermination of the game. 
This will make it the more difficult for those who 
are really acquainted with the magnitude of the problem to 
prevent rash actions and panic legislation. 
What will have been achieved if the game is exterminated 
in an infected area at great expense and trouble, and it is then 
found that the tsetse flies or other transmitting agents remain 
and are still highly infective ? Little or nothing which could 
not have been achieved by other and less drastic and costly 
measures. 
Take for example the experiment of removing the native 
population from the infected areas of Lake Victoria in Uganda 
which has been carried out. After three years it has been 
found that the tsetse flies are still infected with Trypanosoma 
gambiense ; that is to say, that the or at least a reservoir of 
infection still exists. 
Next, suppose that all the game in these areas is exter- 
minated, an undertaking which will only be carried out with 
great difficulty and expense, and it is then found that the 
tsetse flies are still infective, a highly probable result. 
To describe the situation as 4 disappointing 5 would be 
utterly inadequate, and the word 4 hopeless ’ is far more appro- 
priate to such a method. For the position then apparently 
resolves itself into the extermination of all vertebrate 
