SPRAYING 155 



solutions will keep for some time ; if they stand for 

 several weeks they become considerably concen- 

 trated through evaporation of the water. 



To use these stock solutions in making up a bar- 

 rel of bordeaux for spraying take four gallons of 

 the copper sulphate solution and dilute it to approx- 

 imately 25 gallons. Then take four gallons of the 

 lime solution and dilute it in another barrel, making 

 approximately 25 gallons. Then pour the copper 

 sulphate solution into the lime solution as before 

 directed, stirring thoroughly. 



No matter how the Bordeaux mixture is made it 

 should be strained before using. To do this put it 

 through cheesecloth as it goes into the spray tank. 



In making up large quantities of Bordeaux a great 

 amount of labor can be saved by a convenient ar- 

 rangement of barrels or tanks. The usual way is to 

 build a platform, preferably in two stories, say 6 and 

 12 feet high. The stock solutions are made up in 

 tubs, barrels or tanks on the upper platform. They 

 are also ladled out and diluted on this upper stage. 

 They are then allowed to run together into a trough 

 conducting them to a barrel on the lower platform. 

 They mix as they run together into the trough, and 

 this mixture should be vigorously stirred in the 

 barrel during the operation. The mixture thus com- 

 pleted is drawn off by gravity into this spray tank, 

 passing through the cheesecloth strainer on its way. 



This staging must be made high enough so that 

 the completed mixture will run down into the 

 mounted spray tank. There must be arranged a 

 convenient water supply, sending water easily up to 

 the top platform. This staging can be used in mak- 

 ing and handling other sprays, though it is espe- 

 cially adapted to the manufacture of Bordeaux. 



A word needs to be said about the chemicals used. 



