FLIES 



271 



washed fairly clean. The germs with which it was more or 

 less covered become dissolved free from the dirt and dissemi- 

 nated throughout the entire mass of milk. Flies may be pre- 

 vented around the stable and country home to some extent by 

 careful removal of barnyard manure and other waste. At- 

 tempts are also being made to kill the larva or maggot in the 

 manure heap by sprinkling over it powdered borax, also by con- 



3 facing outward 

 :owa to stand on. 



Note method of building in the blocks for the 

 (Courtesy James Mig. Co.) 



structing cement pits over which the manure is laid on slats. 

 The larvae fall through and are killed in the kerosene water 

 below. After flies have reached the adult form some may be 

 caught by means of various fly traps. About the stable and 

 back door of the kitchen and like places more effective exter- 

 mination of flies can probably be brought about by poisoning, 

 one of the best means known to the writer being skim milk into 

 which formaldehvde has been stirred at the rate of three tea- 



