38 N. J. Mosquito Extermination Association 



7,675, and Carteret Marsh, 200. Most of this work was spur 

 ditching to supplement systemis already installed. On that sec- 

 tion of the Raritan Marsh under the commission's direct control, 

 and on the Woodbridge Creek Marsh, the drainage systems were 

 completed. 



In addition to the hand ditching, the system of controlling the 

 remnants of broods which the existing ditches had not prevented 

 was continued by the vise of oil. On four different occasions during 

 the 1918 season it was found necessary to resort to oiling to pre- 

 vent broods from maturing. On each occasion the value of oiling 

 as a supplement to incompleted drainage systems was clt-arly dem- 

 onstrated, as the broods were very satisfactorily destroyed. 



The Raritan Ordnance Depot is located on the north side of the 

 Raritan River, between Perth Amboy and New Brunswick. Their 

 reservation includes 1,400 acres of the Raritan Marsh, among 

 which is the acid infested meadow which caused so much trouble 

 in 1917. The Sanitary Corps of this depot took over the control 

 of the marsh within their boundaries, under the supervision of the 

 county commission. Operations were carried on throughout the 

 breeding season and absolute control of the broods in this section 

 resulted. A tide gate was installed on the main creek of this ter- 

 ritory and the marsh is being dyked at the present time. Due to 

 construction work on the marsh, the effect of the ditching installed 

 previous to 1918 was destroyed, and the Sanitary Corps is now 

 reconstructing the existing system by means of the commission's 

 power ditcher. Approximately 50,000 additional feet of 10 by 30 

 ditches are necessary, which they plan to complete before the 1st 

 of May, 1919. 



The T. A. Gillespie Loading Co. is located on the west side 

 of Cheesequake Creek, their property extending over a portion t)f 

 the marsh. As the control of sollicitans was of vast importance 

 to them, due to the large force of labor employed in constructing 

 their plant, they supplied the commission with from eight to four- 

 teen men, including a competent foreman, to carry on the neces- 

 sary work in this section. This force worked from the 1st of 

 May until September, redigging 50,000 feet of ditches which were 

 in a very serious condition, and installing approximately 10,000 

 feet of new ditching. Here also the work was a great success, 

 and no broods escaped during the heavy breeding season. 



