The Mosquitoes of New Jersey 71 



Still more recently Mr. Fred A. Reiley, Superintendent of the 

 Atlantic County Mosquito Extermination Commission, has invent- 

 ed an improved type of ditching plow. This plow cuts a ditch 10 

 inches wide and 30 inches deep, and is so arranged that it will en- 

 ter the marsh without any preliminary digging and can be drawn 

 out of the marsh, when the end of the ditch has been reached, by 

 the use of power. This ditching plow looks much like the one in- 

 vented by Mr. Eaton, but has the additional features of entering and 

 of removal as specified. Mr. Reiley also has devised an entirely dif- 

 ferent and a much more efficient power plant. He makes use of a 

 Fordson tractor, the wheels of which are fitted with wide extension 

 rims, a drum is installed on the rear of this tractor and a cable of 

 various length is employed for pulling the plow. After the plow 

 has been drawn up to the tractor- the tractor rapidly moves ahead 

 to the new point, the anchors are drawn in, the power of the motor 

 is thrown on to the drum and the cable is wound by drawing the 

 plow up to the advanced point. 



The efficiency of this new machine is such that as much as 10,000 

 feet a day can be cut under favorable conditions. 



Treatment of the enclosed salt marsh 



In some instances the. drainage established by nature has been 

 so interfered with by the activity of man in the building of railroads, 

 roadways, dikes and banks, that reopening sufficiently wide outlets 

 has become impracticable. Furthermore, this shutting in has in 

 some cases so interfered with the vegetation that it has died and the 

 marsh surface lowered in extreme cases as much as 3.5 feet. To 

 make a bad matter worse, at many points the raw sewage from large 

 populations has been emptied into these artificially formed basins. 



The solution of the problem thus created involves the shutting out 

 of the sea and the removal of such water as occurs behind the bar- 

 rier either by gravity through sluices or by lifting out with pumps. 

 A considerable fund of experience is now available for the treatment 

 of shut-in marshes that have and have not shrunken. In the neigh- 

 borhood of 6000 acres have been thus more or less completely treat- 

 ed for mosquito control. In giving an account of the methods em- 

 ployed in solving the problems involved it seems advisable to treat 

 first the enclosed, non-shrunken, free-from-sewage areas, then the 

 enclosed shrunken marshes and finally the enclosed shrunken and 

 sewage polluted basins. 



The enclosed, non-shrunken and sezvagc-free salt marsh. The 

 problem on the first type (enclosed, non-shrunken and sew- 



