PREVENTIVE MEASURES 199 



of manure daily ; the^ larger work horses produce twenty 

 to thirty pounds per day, but, as they are out of the 

 stables most of the time, the actual amount to be treated 

 would be much less. The average cost of the treat- 

 ment would be one and one-half to two cents per horse 

 per day. It is stated also that iron sulphate has the ad- 

 vantage that it completely deodorizes the manure. 



Experiments were also made under Forbes's direc- 

 tion with borax, with a mixture of sodium arsenate and 

 borax, with a lime-sulphur solution, with salt, and with 

 carbon bisulphid. It was found that a solution of thir- 

 teen ounces of borax to three- fourths of a gallon of 

 water sprayed over fifteen pounds of infested manure 

 destroyed over ninety-nine per cent, of the maggots. A 

 gallon of water containing eleven and one-half ounces 

 of borax and seven ounces of sodium arsenate applied 

 to twelve pounds of manure killed all of the larvae. A 

 pint of lime-sulphur solution in a gallon of water ap- 

 plied to twelve pounds of manure killed eighty-six and 

 four-tenths per cent, of the larvae, while a pound and 

 a half of salt to one gallon of water applied to twelve 

 pounds of manure killed eighty-eight ~and eight-tenths 

 per cent. 



A fluid ounce of bisulphid of carbon evaporated in a 

 closed box fourteen inches by fourteen inches by nine 

 inches, containing twelve pounds of manure, destroyed 

 ninety-nine per cent, of the larvae. 



Whenever the subject of treating manure, in order 

 to kill the maggots which are living in it, is mentioned, 

 the question arises : What effect will the treatment have 



