PREVENTIVE MEASURES 217 



or city, could completely exterminate the filth fly by 

 intelligent and co-operative effort during the months 

 of April and May (and possibly June) of any year." 



In this connection it may be well to call attention 

 to the device invented by Kellers (1911), which is a 

 wire gauze garbage-can holder which will contain sev- 

 eral garbage cans. It allows daily inspection and free 

 circulation of air. It aids in the suppression of the 

 fly nuisance and the prevention of the scattering of 

 putrescent material by rats, cats, and other animals. 

 The designer of the holder is a hospital steward in the 

 United States Navy, and the one first designed is in 

 use at the U. S. Naval Hospital, Puget Sound. Some 

 such arrangement for hospitals and other similar in- 

 stitutions will be excellent, and the addition of Hodge's 

 fly-trap idea will be easy. 



SPECIAL CONSIDERATIONS FOR TOWNS AND CITIES 



In the country, the individual householder should 

 care for his own surroundings in such a way as to 

 free himself from flies, but in communities this will not 

 be effective. A single stable owner by the proper care 

 of his manure may greatly reduce the local supply, 

 but there will still be many thousands from other stables 

 in the neighborhood and from other possible breeding 

 places nearby. It becomes necessary therefore that an 

 organization of some kind or some system of co-opera- 

 tion should exist in communities. 



