36 LIFE AND HABITS OF DOMESTIC MOSQUITOS 



of a later generation to her own, for her refertilisation. 

 Consequently it must be realised that domestic mos- 

 quitos will not fly far from their breeding-places, for 

 if there is plenty of food near, there is no reason why 

 they should. It can hardly be expected that mos- 

 quitos will fly from one part of a town to another, 

 merely to gratify a whim of geographical curiosity. 

 This is a matter of the greatest importance, and it 

 has been proved experimentally, for it has been found 

 possible to prevent mosquitos in one part of a town 

 while they continue unchecked in another ; even 

 then they will not fly into the cleared district. 



Objections have often been raised against pro- 

 posed anti-mosquito campaigns, that mosquitos will 

 fly in from the uncleared districts round about, and 

 so render the campaign futile. This is not true. 

 Mosquitos do not fly far, for the reasons given above. 

 Limited campaigns have been instituted as an ex- 

 periment in small portions of large cities, and so long 

 as they were conducted properly they were success- 

 ful. Port Said and Cairo were examples of this. If, 

 however, there happens to be a swamp that is breed- 

 ing mosquitos outside a town, and there is no food 

 near which the fertilised mosquitos can obtain readily, 

 then a few females will find their way into the town ; 

 but their numbers will be very small. An occasional 

 mosquito is conveyed by trains and ships, but the 

 numbers never seriously affect a cleared district. 

 Such objections are only raised by lazy admini- 

 strators. 



To summarise : The fecundated female mosquito 



