58 THE HOUSE FLY 



garden watering-can with a fine rose. The sulphate of 

 iron has the advantage of destroying the offensive smell 

 of manure, garbage, &c., in addition to killing fly maggots. 



When manure is required for fertilising purposes, sul- 

 phate of iron should be used, as this salt in the strength 

 required to kill fly maggots does not seriously diminish 

 the plant-food value of the manure. 



A gallon of water in which i Ib. of borax and 8 oz. 

 of sodium arsenate have been dissolved will destroy all 

 the fly maggots in 15 Ib. to 20 Ib. of manure or garbage, 

 if sprayed over it while being turned over with a fork : 

 2 Ib. common salt to a gallon of water sprayed on 15 Ib. 

 garbage or manure will destroy at least 90 per cent, of 

 the fly maggots it may contain. 



