FRUIT AXU VEGETABLES. 121 



395. A fruit grower who made lime-sulphur mixture 

 for spraying, found that making the stuff in Large quanti- 

 ties cost him 8 cents a gallon, but that his mixture would 

 go only 80 per cent as far as commercial material which 

 cost $4.50 a 50-gallon barrel. Supposing the results upon 

 the crop to be equal, would it be more economical for 

 him to make his own spray or to buy it, and how much 

 money difference would there be? 



396. A fruit grower bought 600 pounds of arsenate of 

 lead at $7 a 100 pounds to spray for codling moth lar- 

 vae (apple worms). He used only GO per cent of it and 

 the balance was left over till the following year. Sup- 

 pose interest to be 5 per cent, how much would he have 

 saved or lost if he had bought the amount he needed each 

 of two years at 8 cents a pound ? 



