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. 
