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up the good work if we expect to reap the benefit. Educate our 

 children to understand the reason why and the necessity for 

 destroying- the mosquito. 



In closing, I want to say that the Board of Conservation and 

 Development is very much interested in this subject, and any 

 cooperation we can give to the furtherance of this cause will be 

 cheerfully given at any and all times. 



The President — Gentlemen, there are other men upon whom 

 I wish to call later, but we have one important paper left. I 

 don't know that I can introduce to you more fittingly than has 

 already been done many times the reader of this paper, but I am 

 sure that New Jersey can congratulate herself upon having a 

 State Entomologist of the knowledge and energy of Dr. Thomas 

 J. Headlee. Certainly my duties as President of the Association 

 during the last three years would have been much more difficult 

 had it not been for his willing aid at all times. It gives me 

 pleasure to introduce Dr. Headlee as a friend and as a worker 

 in this cause. 



The Value of Experimental Study to the Practical Work of 

 Mosquito Control. 



BY THOMAS J. HEADIvEE, PH.D., ENTOMOLOGIST OF" N. J. 

 EXPERIMENT STATIONS. 



Study of the problem of mosquito control by means of experi- 

 ment has proven the only sound basis for the practical work 

 of extermination. Methods in use in this practical work at 

 present are susceptible of improvement. Experimental study 

 of the problem should be continued. 



In the process necessary to the control of any injurious insect, 

 the first step is to obtain a knowledge of the natural history of 

 the species. This involves a study of its individual and seasonal 

 life-cycle in relation to the environment in which it lives. What 

 is its food and how does it secure it, how does it grow, how does 

 it reproduce and what is the way in which it does its injury, 

 are the questions that must be answered. At any one of these 



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