348 TSETSE FLIES 



their final extinction. Others, myself included, 

 joined in the discussion, but I fancy but little 

 beyond assertion against assertion was reached. 

 At all events the public began to realise the 

 trend of events, and the danger in which Africa's 

 splendid fauna was soon to find itself. That 

 danger now begins to assume an acute form. 



Speaking at a meeting held recently under the 

 auspices of the Liverpool School of Tropical 

 Medicine, Dr. Warrington Yorke, one of those 

 gifted experts whose researches in Rhodesia laid 

 bare the important results which I have just 

 outlined, attempted to furnish something in the 

 nature of a suggestion as to how far the diffi- 

 culties of dealing with so apparently hopeless a 

 proposition as the rooting out of sleeping sick- 

 ness could be overcome. He proposed that, as 

 there was considerable evidence that tsetse flies 

 spread with the game, and increased in numbers 

 as the herds increased — as the great game 

 formed the reservoir of sleeping sickness virus, 

 which the fly transmitted to the human being, the 

 only chance of getting rid of the possibility of 

 further infection was to " drive back the game 

 from the neighbourhood of human habitations." 

 He further proposed that a census of the popula- 

 tion should be taken, and the proportion suffering 

 from sleeping sickness noted, an index of the 

 percentage of infected flies ascertained, and these 

 steps repeated over prolonged intervals of time. 

 The keynote of the address, however, was the 

 driving back of the great game from the neigh- 

 bourhood of human habitations, as though it 



