40 N. J. Mosquito Extermination Association 



maining marsh land of the county with the funds provided by the 

 Freeholders. 



At the . completion of the maintenance work, a maximum of 

 125,000 feet of machine ditching will be installed, completing the 

 drainage of the Carteret and Sewaren Marshes; oil will be used 

 to supplement the existing systems wherever necessary, and expert 

 oversight will be offered to any municipality desiring to finance 

 its own fresh water campaign. At the same time, earnest efforts 

 will be made to interest the mosquito extermination committee of 

 the Board of Freeholders in the work being done in order to secure 

 their support for a much needed increase in -our yearly appro- 

 priation for 1920. 



President Engle: That is a very interesting paper. Any dis- 

 cussion? If not we will hear from Mercer County, by Dr. Ulric 

 .Dahlgren, of Princeton. 



Mercer County 



BY ULRIC DAHLGREN, PH.D., PRINCETON UNIVERSITY 



Dr. Ulric Dahlgren: . Mercer County is one of the fresh 

 water propositions, and a small one at that. In fact, the work of 

 Mercer County has been confined to the vicinity of Princeton, on 

 account of the malarial mosquitoes there, the anopheles, which 

 formerly caused a large number of cases of malaria each year. I 

 don't know of any township in Mercer County other than Princeton 

 in which the malarial problem has recently cropped out, or in which 

 it can positively be stated that the quadrimaculatus has been dis- 

 covered. 



However, as I have told you before, we attacked this problem. 

 We went to the Freeholders and collected the money and promised 

 them that if they would give us that money we would not ask for 

 any more, that it was enough to finish the job — a very foolish pro- 

 ceeding, perhaps, if we had not been very sure that we could do 

 the job. Well, we have it nearly done. He have, perhaps, nine- 

 tenths of it completed, and did it all in a permanent fashion with 

 filling and ditching of such permanent character that I do not 

 think it will ever have to be done over again. But, of course, 

 there are conditions, little odds and ends, that have to be filled up, 

 and one of those got somewhat the best of us this summer, or at 

 least it surprised us. 



