10 N. J. Mosquito Extermination Association 



trees and logs three feet or more in diameter. It was expensive, 

 slow and tedious work. 



Near the town of Americus, Ga., Muckalee Creek had to have 

 its center line straightened and years of collection of fallen trees 

 and logs removed in order to keep water off the flat lands ad- 

 jacent to its banks. During operations a cyclone travelled up the 

 creek bed and increased existing troubles. 



Surrounding the cantonment at Jacksonville, Fla., is a sandy 

 formation that will stand only on a very flat slope. The ditching 

 there was made difficult by the presence of the roots of a palm 

 plant which are as thick as one's arm and from which radiate smaller 

 roots located close together, that make the removal of the main 

 root expensive. A large part of the ditching work there was done 

 by dynamite. Also in that locality a branch of the St. John River 

 contains much tightly packed water hyacinth which had to be 

 remijoved. 



In the environment of Montgomery, Ala., a large part of the 

 ditching was accomplished by means of a ditching plough drawn 

 by two mules — mile after mile of ditch was thus installed at a 

 cost of about fifty-five ($55.00) dollars per mile. The topography is 

 fairly flat and soil suitable for this means of ditching. Also some 

 ponds and wet places were drained to a porous gravel substratum. 

 The vertical drain holes were kept from silting up by means of 

 screen entry boxes. 



Surrounding the cantonment at Hattiesburg, Miss,, are sandy 

 hills, but in the ravines are narrow areas of wet silt-like formation 

 six to ten feet deep, penetrated by heavy masses of large roots. It 

 was found too slow and expensive to excavate ditches by hand 

 work in such places, but drainage was accomplished by blasting 

 center ditches and installing side seepage ditches where necessary. 



In the Gulfport, Miss., area are a series of hollows parallel to 

 the Gulf shore line. In some places nine such parallel water-hold- 

 ing depressions occur within one mile of the shore line. Most of 

 the swamps contain a heavy root growth and have but litle grade, 

 so wide bottom ditches have to be used, as the ditches are long and 

 the possible permanent outlets few in number. 



At some of the areas in Texas mosquito breeding is confined to 

 storm water ravines which contain many pot holes. This is the 

 only source of water supply for the cattle in many instances. The 



