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would be sufficiently great to make its future control much 

 easier. But health boards sometimes hesitate to exercise the 

 authority they have in the matter. 



A map showing the location of all important breeding places 

 within the protected area should be on file in the office of the 

 Commission, also a record of the owners on whose property 

 breeding places are located. This information is of the utmost 

 importance to the man in charge of the work if he expects to 

 make mosquito extermination successful in his county. 



The city problem of mosquito control consists largely of what 

 may be called unsanitary mosquito conditions, including barrels, 

 cisterns and cesspools, and other small containers from tomato^ 

 cans to empty beer bottles. Many yards and vacant lots have 

 a generous litter of tin cans, which increase the possibility of 

 mosquito annoyance. Where such conditions exist, many people 

 believe that cleaning up their backyards consists of dumping 

 their tin cans over the rear fence. It does not make any differ- 

 ence to Mrs. Mosquito on which side of the fence the can of 

 w^ater is, all she wants is undisturbed possession for a few days, 

 then some one is reminded that it does not pay to throw tin 

 cans over the back fence. When it is considered that even small 

 quantities of water in these containers may serve for the de- 

 velopment of innumerable larvse, the importance of its removal 

 can be realized. The rain barrel problem in cities and suburbs 

 of cities is one oif the hardest we have to deal with. A close 

 inspection in those districts where barrels are numerous is the 

 only way this kind of breeding can be kept under control. A 

 single barrel is insignificant in itself, but when we find a uni- 

 form distribution of i,ooO' barrels throughout a city, then it 

 becomes a part of mosquito work that can not be neglected. 

 Nature has provided the mosquito with sufficiently numerous 

 breeding places, but in addition to these, wherever man has 

 developed a centre of activities he seems to have unconsciously, 

 but almost invariably, provided more of them, and sometimes 

 the artificial breeding places are more prolific than the natural 

 ones. The uncovered rain barrel and tub is part of man's con- 

 tribution to the conditions that make mosquitO' breeding possible. 



