302 



GENERAL SCIENCE 



fly may be the progenitor of 195,312,500,000 flies, or about one 

 hundred and ninety-five thousand bushels, if none of the flies are 

 destroyed. This shows the necessity of destroying the fly whenever 

 it is possible. 



Flies travel from decayed matter in which there are typhoid 

 germs, and carry them to milk which is to be used for children. A 

 fly may alight on sputum on the sidewalk, or it may come directly 

 from some filthy place to the table where food is about to be served. 

 People should screen their houses and use fly traps. Garbage 



18 INCHES 



20 INCHES 



FIG. 192a. 



FOR FUES TO ENTER -/ 



FIG. 1926. A very successful fly trap. 



should be well covered. Also, for the sake of health, people should 

 avoid expectorating in public places. 



It takes about 6000 flies to weigh an ounce. 



Build a fly trap and see how many flies you are able to destroy in 

 one season. 



Using fly paper i a good way to destroy flies, as germs as 

 well as flies are caught. Pyrethrum powder burned in a house 

 stupefies flies until they may be swept up. Twenty drops of car- 

 bolic acid on a hot shovel create a vapor that kills flies. Common 

 mignonette plant seems to prevent flies from living in the room 

 where it is growing. A cheap manufactured poison not dangerous 

 to human life is bichromate of potassium in solution. One dram, 

 dissolved in two ounces of sweetened water and placed in a shallow 

 dish, will kill a great many flies. A spoonful of formaldehyde in 

 a quarter of a pint of water will dispose of a great many. Cleanliness 

 prevents flies from breeding. 



Flies may carry diseases many miles. They have been known to 

 travel from New York to Maine in a sleeping car. 





