214 N. J. Agricultural Experiment Station, Bulletin 348 



has involved the cutting of 18,244,217 linear feet of ditches 10 inches wide 

 and 24 to 30 inches deep, or their equivalent, the building of 18.2 miles of dike, 

 the installation of 80 sluice and tide-gates (representing 932 square feet of 

 cross section), and the installation of one 4, one 8, and one 12-inch centrifugal 

 pump. Approximately 60 per cent of the reasonably permanent pools scattered 



Fig. 128. Map showing progress of salt-marsh mosquito control. 



over 315,000 acres of upland have been permanently eliminated. . . . Approxi- 

 mately 120,000 acres of salt marsh have been patrolled throughout the mosquito 

 season, and the mosquito-breeding destroyed in so far as possible. Approxi- 

 mately 315,000 acres of upland have been likewise patrolled, a large amount 



