no N. J. Mosquito Extermination Association 



President Rider: The other amendment was made. That was 

 not seconded, hence the original motion is now before us, and now 

 the second amendment is seconded. 



Mr. Engle : I will withdraw my motion and second this motion. 



President Rider: The original motion is withdrawn, and with 

 the consent of the second? 



A Member: Yes. 



President Rider : And the motion is now that it be referred to 

 the executive committee. Are you ready for the question? All in 

 favor say aye ; opposed no. It is so ordered. 



Now there is nothing but the new program. Next on the pro- 

 gram, that is, after our business session, is, "Practical Drainage 

 Systems, Their Variations, Cost of Installation and Cost of Up- 

 keep." Twenty minutes is allowed for this discussion, and the 

 man who will discuss it is Jesse B. Leslie, Superintendent Bergen 

 County Mosquito Commission. 



Jesse B. Leslie : In considering the subject of practical drain- 

 age systems for mosquito control, it is quite necessary to bear in 

 mind the fact that such drainage systems have a definite object in 

 view and that all general rules applicable to drainage for other pur- 

 poses should not always be closely followed in designing and con- 

 structing such systems. In fact, sometimes ditching which is entire- 

 ly satisfactory from the standpoint of eliminating mosquito breed- 

 ing would be hopelessly inadequate for agricultural or other develop- 

 ment and on the other hand you too often find that ditches which 

 keep a certain area well enough drained for the accomplishing of 

 a particular purpose are themselves intensive mosquito breeders. 

 In mosquito ditching, there are two main objects to be fulfilled, ist 

 to draw the surface water from all the separate pools, pockets, rat- 

 runs, and depressions into a main pond, ditch, or a series of ditches 

 and 2nd to provide adequate means to prevent larvae from maturing 

 in such central places after the water has been thus pounded. Each 

 place to be drained presents its own unique problem and a discussion 

 of drainage methods could well embrace a long and detailed analysis 

 of many varied questions. It is not the purpose of this paper to 

 attempt such an analysis but merely to touch briefly on the chief 

 underlying and fundamental principles. And as mosquito work 

 naturally divides itself into salt marsh and inland drainage, it would 

 probably be wise to consider these separately. 



The drainage of the salt marshes is undoubtedly the biggest 

 problem of mosquito control in New Jersey today and the working 



