SPRAYING AND DUSTING FOR LEAF DISEASES 359 



tion of copper sulfate by hanging the crystals in a cloth bag in a 

 barrel of water. As many pounds of copper sulfate should be 

 placed in the bag as there are gallons of water in the barrel. 

 After several hours the copper sulfate will have dissolved. 

 Next prepare a stock solution of lime which will contain one 

 pound of quick-lime in each gallon of water. The proper 

 amount of stone-lime is slaked, enough water being added to 

 prevent the lime from burning. When all the lime is powdered, 

 enough water is added to make the strength one pound of lime 

 to one gallon of water. To make fifty gallons of bordeaux mix- 

 ture, take five gallons of the stock solution of copper sulfate 

 and pour it into the spray tank. Add about thirty gallons of 

 water and then pour in five gallons of the stock solution of 

 lime and stir the mixture thoroughly. Enough water is then 

 added to make fifty gallons in all. 



