214 THE HOUSE FLY—DISEASE CARRIER 
as our protection against Musca domestica is con¬ 
cerned.” 
He plans certain lines of attack, all directed against 
the adult fly out of doors. The first of these lines con¬ 
sists in the effort to trap the flies at their source of 
food supply. On the supposition that everything in 
the way of waste food which is attractive to flies is 
or can be placed in garbage cans or swill barrels, he 
believes that a double wire screen trap can be attached 
to this receptacle in such a way as to catch every fly 
that is attracted to it. He shows that in some cities 
the rules of the boards of health require that all such 
receptacles should be tightly covered. He considers 
that this is a serious mistake, since it drives the flies 
from the garbage into the kitchens. The garbage cans, 
to his idea, can be made so attractive as to draw the 
flies out of the kitchens and focus them at' one spot 
and catch them as soon as they come. As fast’as the 
traps are filled, the contents are scalded and removed 
and fed to chickens or put into the garbage can. 
He has devised a trap attachment to garbage cans 
with which on one occasion he caught 2,500 flies in 
fifty-five minutes. This was back of a market in an 
ice-cream stand. The can was baited with fish heads, 
meat scraps, watermelon rinds and green corncobs, 
over which the melted waste from the ice-cream freez¬ 
ers was poured. The cover of this can was held up 
by strips of metal soldered to the can so as to keep 
about a quarter of an inch fly space entirely around 
the can through which the flies could enter. Then a 
