2i8 N. J. Agricultural Experiment Station, Bulletin 348 



With the exception of some drainage carried out very early on the Newark, 

 Elizabeth and Jersey City meadows, all this work has been done by the State 

 Agricultural Experiment Station and the county units. The latter began in 

 1912. Table 5 shows the relative part played by each. 



Table 5 

 Ditching by Experiment Station and County Commissions 



*Maximum figures, probably 25 per cent too high. 



**In 1912 the practice of going over every foot of the entire system obtained. 



While in 1912 the station was doing 81 per cent of the total drainage, in 

 1919 it did about 17 per cent. Nevertheless, it must be said that the services 

 of the station have constantly been at the command of the county units, and 

 that the drainage done by it in no adequate way measures the part played by 

 it in the accomplishment of this drainage. 



Results of Mosquito-Control Work in New Jersey 



There are several criteria for measurement of the result of salt- 

 marsh mosquito control work, such as the presence or absence of 

 mosquitoes, the state of public opinion as reflected in the newspa- 

 pers and the development of the areas which are normally subject 

 to mosquito flights but which have been largely freed from them. 



Effect on Mosquito Prevalence 



On two or three occasions during each of the last eight mosquito- 

 breeding seasons, the writer has made a collecting trip down the 

 coast running all the way within a few miles of the coast and stop- 

 ping to collect mosquitoes at regular intervals. The results of the 

 July, 191 7, collections which are shown graphically in figure 129 are 

 rather worse than those usually obtained because they show more 

 mosquitoes in the northern end of the state than is usually the case. 



All collections were made in shrubbery or tall weeds in broad day- 

 light. All collections were the work of two collection bottles. When 

 the total catch in 5 minutes reached 30, the limiting factor became 

 the length of time necessary for the bottles to kill. 



