182 THE HOUSE FLY— DISEASE CARRIER 



"After the traps have been attached, some substance 

 should be put into them that will either kill the insect 

 upon falling into it, or on account of its sticky nature 

 will hold the insect so that it cannot escape. For the 

 first, kerosene, kerosene emulsion, soapsuds and py- 

 rethrum are the best ; and for the second, molasses, or 

 a mixture of castor-oil and resin. For general use, the 

 soapsuds are to be recommended. When using the 

 liquids, Ull the traps two-thirds full. 



'There should be one trap for every pane of glass 

 of at least one window in the house. For instance, 

 when the sash contains two panes of glass, as in the 

 cut, there should be two traps, one at the base of each 

 pane. When the sash contains four panes, there should 

 be four traps, two on the bottom rail and two on the 

 cross-bars or munting. It is not necessary to apply 

 traps to all the windows. Attach traps to one or two 

 windows in the sunny part of the house, and pull down 

 the blinds of the remaining windows. The flies will 

 seek the lighted rooms, and especially the windows. 



"When the traps are full of flies, remove them from 

 their fastenings, empty out their contents, and fill them 

 with fresh material. 



"A temporary trap can be made of flexible card- 

 board, following the same directions as for those made 

 of tin. Use glue or pins to fasten the ends. To render 

 the trap water-proof, paint the inside with melted par- 

 affin. This will hold any of the above remedies except 

 the pure kerosene." 



A correspondent. Dr. D. S. Hager, has made a sue- 



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