FRIDAY AFTERNOON SESSION 



(The meeting was called to order at 2.40 P. M. by President 

 Rider). 



President Rider : The meeting will come to order. There were 

 two numbers on our morning program that were not carried out, and 

 we will take those up first before the business meeting. 



Next will be ''Anti-Mosquito Work in Nassau County," by W. M. 

 De Mott, Chief Inspector, Nassau County Mosquito Commission. 



The Nassau County Mosquito Extermination Commission was 

 organized in June, 19 16, with county wide powers directed by law to 

 exterminate mosquitoes throughout the extent of Nassau County. 



SALT MARSH. 



During the past four years, the commission has installed a little 

 over 5 million linear feet of ditches on the salt marsh from In wood 

 to Seaford, draining an area 14 miles long and 3 miles wide, at a 

 cost of $38,827.47. 



During the season of 1920, a salt marsh labor crew consisting of 

 21 men was employed for maintenance and patrol from April to 

 October ist. The cost of maintenance and patrol was $10,471.59. 



After the maintenance and patrol work was discontinued, the 

 commission employed a labor crew to install new ditches on the 

 mainland areas at Seaford, using the new salt marsh ditching spades 

 which I have invented. 



With these new spades we can install the main 10x30 inch ditches 

 for two cents per linear foot, and the spur 8x20 inch ditches for one 

 cent per linear foot. We are saving money by installing our own 

 ditches. We have carried on the ditch digging all winter, and have 

 drained some of the worst breeding areas on the salt marsh in the 

 county. 



There was a marked decrease of salt marsh mosquitoes from 

 Inwood to Wantagh, a distance of 12 miles on the South Shore, and 

 no salt marsh mosquitoes on the North Shore from Great Neck to 

 Cold Spring Harbor, a distance of 17 miles. 



We found our worst breeding areas on Long Beach, Nassau-by- 

 the-Sea, and High Hill Beach where very little work has been done 

 to eliminate the trouble. During the season of 192 1 special efforts 

 will be made to get these beaches under control. 



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