The Mosquitoes of New Jersey 185 



was clearly shown that Standard Oil sample 3 was decidedly supe- 

 rior. It is, therefore, possible to secure a special mosquito oil which 

 is more effective than the usual fuel oil. 



Without doubt there are occasions when persistence of the larvi- 

 cide is a decided detriment and in such instances a light rapidly 

 evaporating substance such as gasoline can be employed. The work, 

 which specific larvicides seem fitted to do, is indicated by the fol- 

 lowing table: 



Nitre Cake — Fire barrels, tubs and in some cases permanent pools. 



Canal Zone — Shallow temporary pools where killing must be quick, flooded 



cellars where wall staining is a serious consideration, pools in which 



the irritating mosquito is breeding. 

 Mosquito Oil — All other water surface which cannot be reached by drainage, 



filling or fish. 



Permanent Work 



Under this head we have those operations of draining, filling, and 

 grading which eliminate mosquito breeding by the removal of the 

 water in which breeding occurs or the elimination of its stagnant 

 condition by the establishment of circulation. Only by accomplish- 

 ing the largest" amount of this type of work, which the temporary 

 suppression and the funds available render possible, can real prog- 

 ress in mosquito control be made. Every mosquito-fighting organ- 

 ization should strive to accomplish as much of this work as possible. 



Filling and grading, especially the former, involve very large 

 expenditures for the results accomplished, but both have the merit of 

 requiring a very small maintenance in succeeding years. Because 

 of the cost, only a small amount of this type of work can be done. 

 Special conditions, such as an abundance of ash-garbage seeking- 

 place for disposal, may make it possible to do a relatively large 

 amount of this work. All opportunities of this kind should be 

 utilized. 



In drainage, however, the mosquito-fighting organization will 

 find it possible to eliminate mosquito breeding on a large scale. 

 Drainage for mosquito control is neither so thorough nor so expen- 

 sive as drainage for agricultural or urban development. It is suf- 

 ficient to remove the water from the surface of the soil or to place it 

 in rapid motion between clean banks. It is necessary to estabHsh suf- 

 ficient drainage to insure that water from the maximum rainfall will 

 be oft" the surface within one week's time or less, and it is best to pro- 



