12XPERIMENT STATION BULLETINS. 519 



lime, thirty-two pounds of sulphur, and eight or ten gallons of water, and 

 then diluting to 200 gallons. 



Place the lime in a barrel and add enough water to almost cover it, 

 as soon as the slaking begins, add the sulphur, which should be run 

 through a- sieve to break up the lumps. 



Stir constantly and add enough w^ater to make a thick paste and 

 then, gradually, a thin paste. As soon as the lime is well slaked, cold 

 water should be added to cool the mixture and prevent further cooking. 

 It is then ready to be strained into the spray tank, diluted up to the 

 full formula, and used. 



Care must be taken not to allow the boiling to proceed too far, "if the 

 mixture remains hot for fifteen or twenty minutes after the slaking is 

 completed, some sulphur will go into solution and injury to the foilage 

 may result. 



The time of adding the cold water to stop the boiling depends upon 

 the lime. With a sluggish lime all the heat in it may be needed, while 

 with limes that become intensely hot, care must be taken not to allow 

 the boiling to proceed too far. 



SOLUBLE SULPHUR. 



There has appeared on the market a form of sulphur that readily dis- 

 solves in water, and is recommended as a substitute for lime-sulphur. 

 It has not been tested by this Experiment Station nor any other so 

 far as we can leara. We therefore are not in a position to pass any 

 opinion upon its value as a spraying mixture. 



BORDEAUX MIXTURE. 



Bordeaux mixture is made of copper sulphate, lime and water. 



These three substances are combined in various proportions, depend- 

 ing upon the kind of plant to be treated. For apples, pears, cherries and 

 plums (except the Japanese varieties) the preparation is usually four 

 pounds of copper sulphate, with about the same amount of lime, to fifty 

 gallons of water. Poison is added as needed. The copper sulphate will 

 readily dissolve in two gallons of hot water, to which should be added 

 enough water to make twenty-five gallons or one-half barrel. Do not use 

 an iron or tin vessel to dissolve this in, as the copper sulphate will de- 

 stroy it, and besides the iron will spoil the Bordetiux. A wooden pail 

 is good. Slake the lime into a thin paste and add water to make twenty- 

 five gallons. Pour, or let these run together into a third barrel, and the 

 ]*>ordeaux is made. When it is emptied into the sj^ray barrel or tank, it 

 should be strained through a brass wire strainer to catch any of the 

 coarse particles. 



• Whenever it is necessary to use a quantity of the mixture, it is de- 

 sirable to have the lime and the copper sulphate in "stock solutions." 

 A quantity of lime is slaked to a i)aste and held so by being covered with 

 water. The copper sulphate, say fifty pounds, is placed in a clean gunny 

 sack and suspended in a barrel (one with wood hoops is much to be pre 

 f erred) containing twenty-five gallons of water. This will dissolve in 

 about a day. One gallon of this "stock solution"* is equal to two pounds 

 of copper sulphate. 



* Always stir this "stock solution" before dipping any out, in order that what is used 

 may be full stren-^th. 



