1918 ENTOMOLOGICAL SOCIETY. 55 



attempt to persuade them that the work is sufficiently important to merit their 

 financial support. The person or persons interested may, through the medium of 

 lectures, newspaper and magazine articles, educate the public to a point where the 

 desired work may be paid for from the public treasury. In any case, the danger 

 and discomfort of present conditions must be constantly contrasted with the safety 

 and comfort of the time when the desired work has been completed. 



Execution of the Plans. 



When the moneys have been secured -the organization necessary to carry out 

 the initial work must be formed. Perhaps the simplest form of organization is 

 the employment of a competent engineer who may be held responsible for the 

 proper prosecution of the work by contractors. Certainly, such a method will not 

 leave the active agent burdened with a supply of tools and useless machinery. 



Maintenance^ Temporary Elimination, and Improvement. 



When initial work has been completed it must be maintained. Breeding, 

 which occurs in the thousands of shallow pools of various sorts which after heavy 

 rains are found in depressions of the ground and in old receptacles and in places 

 of permanent character such as sewer basins, cesspools, cisterns, etc., must be 

 destroyed before the adult mosquitoes can be produced. 



As the work proceeds, many additions to the drainage systems already installed 

 or entirely new plans for districts that may have been overlooked will seem advis- 

 able. Provision should be made to meet such conditions. 



When trying to meet the problems of maintenance, temporary elimination, and 

 improvement of anti-mosquito work over a large area, some methods of testing the 

 value of such work must be devised. Many men will be employed and more or less 

 efficiently supervised. Data on effectiveness as measured in terms of mosquitoes 

 on the wing must be had. The practice of the regular collections of adults as 

 described earlier in this paper will afford the needed facts. After a certain 

 amount of experience the person in charge' of collections will be able to say, under 

 given conditions of temperature, moisture and wind, just how many mosquitoes 

 per selected unit of time mean that the householder living near the point of col- 

 lection will be troubled. Fortunately, he can usually discover the dangerous in- 

 crease in time to find the unchecked breeding and head off the trouble. 



The local director of the anti-mosquito work is able, by examining his map of 

 collections, to see at once where the dangerous increases are, and by making a 

 thorough re-inspection at these points, to discover the inefficiency of his mainten- 

 ance and temporary elimination, and to determine the naturei of improvement 

 needed. Of course his map may also show an invasion. It will then become 

 necessary to trace it to its source and take measures to correct the conditions which 

 have given rise to it. 



Giving the Anti-mosquito Work a Permanent Character. 



After the work of mosquito control has been started and carried forward for 

 several seasons, the problem of insuring the continuance of neces<5ary maintenance 

 and improvement must be solved. The first year of successful work will ordinarily 

 bring about such a gratifying reduction in mosquito trouble, or disease carried by 

 mosquitoes, or both, that the work will stand very high in the opinion of the people 



