Proceedings of Sixth Annual Meeting 93 



they do over large bodies of water will be heavily charged with 

 moisture. During the latter part of June, July and August and 

 the forepart of September the temperature is high enough to favor 

 mosquito flights. 



It thus appeared that from the standpoint of wind direction, 

 wind velocity, humidity and temperature, salt marsh mosquito 

 flights would readily take place during the latter part of June, July, 

 August and the forepart of September, from the salt marshes in- 

 dicated to the regions in which these plants are located. It there- 

 fore seemed necessary in outlining a plan for the protection of these 

 plants to include the completion of the drainage of the marshes 

 which lie to the northeast, east, southeast, south and southwest. 



This involved a tremendous area of marsh and meant a large 

 expenditure of money, and it was deemed wise to present three 

 different plans of procedure. First, a plan that would give com- 

 parative freedom; second, a plan tiiat would give practical free- 

 dom; and third, a plan that would give as near absolute freedom 

 from the pest as might be had. 



Detailed specifications were given for each of these plans as 

 to the areas to be drained, their location in the counties, the 

 acres drained, the acres undrained, the footage of ditch required, 

 and the cost. 



Plan No. 1 contemplated the drainage of the salt marshes in the 

 basins of the MuUica River, Great Egg Harbor a,tid Tuckahoe 

 Rivers, in the counties of Burlington, Ocean, Atlantic and Cape 

 May, and involved the cutting of 9,070,720 lineal feet of 10-inch 

 by 30-inch ditch, or its equivalent. On a short time basis (150 

 days), it was estimated that the actual contract cost would be 

 $204,091.20, and the overhead charges for inspectors would be an 

 additional $4,677.07. On a long time basis, or a period of one year 

 we estimated the cost would be $181,414.80, and the overhead charges 

 would be the same as in the shorter period of time. With this 

 plan carried out, the plant located at Elwood would rarely be 

 visited by salt marsh mosquitoes, but the plant located at Mays 

 Landing would probably have visitations several times during the 

 season. These visitations would, however, be of short duration and 

 greatly reduced in severity. 



Plan No. 2 contemplated the completion of the drainage of 

 all salt marsh within a radius of twenty miles of these plants and 



