Proceedings of Sixth Annual Meeting 11 



reduction of the number of holes and deepening the remaining ones 

 to prevent their rapid drying, was one method of control. 



Near Camp Pike, Arkansas, some of the stream beds contain 

 large boulders which made draining of the stream^s expensive. At 

 the aviation field in Arkansas, as well as at Lake Charles, La., rice 

 fields, which are probably the most prolific sources of Anopheles, 

 were located within flight range of the cantonments. 



At most of the camps construction work was in progress or troops 

 present when malaria work was started, so to a large extent tem- 

 porary measures were used at first, and permanent work done 

 as rapidly and more or less thoroughly as conditions would allow, 

 in order to get as much quick relief as possible. This work was ac- 

 companied or followed by complete drainage of areas within flight 

 range of districts to be protected. 



As in the environment of the Hog Island Shipyard, many acres 

 of cattail growth had to be cut down and kept under oil control 

 until the ditching systems were established — in order to get an im- 

 ntediate mosquito control. So it was elsewhere. 



Excellent results were accomplished by the Army Sanitary Corps 

 within the military reservations. Most cordial relations existed 

 between officers of that corps (whose duty it was to prevent mos- 

 quito production within the military cantonment) and the officers 

 of the United States Public Health Service, who directed similar 

 measures in a strip of land one mile wide surrounding each can- 

 tonment, in the cantonment town and in an area about a mile wide 

 surrounding the town. In addition, it was frequently necessary to 

 undertake similar control operations at distant amusement parks 

 and additional areas where enlisted men and war industry em- 

 ployees congregated. 



Results Accomplished. 



It was not possible to get rid of all Anopheles immediately, as 

 camps were established in rapid succession in widely separated 

 areas from New Jersey to Texas, and Memphis, Tenn., to Jack- 

 sonville, Fla. Successful malaria control work was carried out in 

 forty-three separate areas in fifteen states. In addition to the can- 

 tonment areas themselves. Anopheles control has been accomplished 

 in a total area of over 1200 square miles. Where cantonments 

 have been located in notoriously malaria sections very little malaria 



