SPRAYS AND SPRAYING 1 29 



coarse sack and suspended in the top of the water in a 

 wood, brass, or porcelain vessel usually a wooden 

 barrel, as it corrodes iron. The copper sulphate sinks 

 in the water as it dissolves, and a gallon of water will 

 dissolve 3 pounds of copper sulphate. This is a satu- 

 rated solution. If 6 pounds of copper sulphate are re- 

 quired to a barrel of water, 2 gallons of this stock 

 solution should be used. 



Mixing. It is economical to have an elevated stage, 

 under or alongside of which the spray-cart may be 

 drawn. Place four 5o-gallon barrels on this stage, 

 two of which are for the stock solutions of lime and 

 copper sulphate, and two for making the mixture. 

 To make 50 gallons of Bordeaux mixture, pour 2 gal- 

 lons of copper sulphate saturated solution into one 

 barrel and fill it up to the 25-gallon mark with water. 

 Stir up the stock solution of lime and dip out as much 

 as is required; if 5 pounds, then the solution equivalent 

 to this amount; strain it, to exclude particles which 

 might clog nozzles, into the lime-mixing barrel, and 

 fill up to the 25-gallon mark and stir. The mixing- 

 barrels should be provided with 2-inch or 3-inch rubber 

 hose, one end of which is attached in an opening near 

 the bottom of the barrel, the other free. When ready, 

 put the hose from each barrel into the spray- tank, and 

 let them empty and mix together. The rubber hose 

 should be long enough so that the free end can be 

 turned over into its barrel when not in use. If desired, 

 the stock-solution barrels may be placed above and 

 over the mixing-barrels, so that dipping out solution 

 is avoided; it may be run out through a faucet. 

 Convenience to a water-supply expedites the work. 



