FARM SANITATION 219 



Yellow fever is also spread by a certain kind of 

 mosquito which is common in our Southern states. 

 By destroying the water breeding places, the yellow 

 fever has been stamped out of such cities as New 

 Orleans. Mosquitoes on the farm may be disposed 

 of by draining pools of standing water so the pest 

 cannot multiply. Large ponds may be covered with 

 oil so the ^'wigglers'^ which hatch into mosquitoes 

 can not get air at the surface of the water. Barrels 

 or other vessels filled with water must be emptied 

 or covered with oil. 



The House Fly. The eggs of flies are laid in wet, 

 decaying refuse, such as manure, slop, dead animals, 

 garbage, and human waste. The eggs hatch into 

 maggots which feed upon these materials and grow 

 rapidly. Then they cover themselves with a leather- 

 like case and are quiet a few days, after which they 

 come forth as full-grown flies. It requires only a 

 few days for the egg to grow into an adult fly. A 

 few flies live through the winter, and these start 

 broods in the early spring. By the end of summer 

 there are flies without number. 



Flies as Disease Carriers. Flies carry upon their 

 feet and mouths the germs of disease. They visit 

 all sorts of filthy places to lay their eggs and after- 

 wards approach our kitchens in search of food, and 

 wherever they crawl they scatter disease germs. 

 The house fly has been called the typhoid fly. 



Fighting Flies. There are two ways to protect 

 the family from flies. One is to clean up all garbage 



