426 REPORT OF STATE BOARD OF HORTICULTURE. 



"The foreg-oing directions apply to cases where small quantities of the 

 mixture are needed for more or less immediate use. If spraying is to be 

 done upon a large scale, it will be found much more convenient and economi- 

 cal in every way to prepare what are known as stock solutions of both the 

 copper and lime. To prepare a stock solution of copper sulphate, procure a 

 barrel holding fifty gallons. Weigh out one hundred pounds of copper sul- 

 phate, and after tying it in a sack suspend it so that it will hang as near the 

 top of the barrel as possible. Fill the barrel with water, and in two or three 

 days the copper will be dissolved. 



"Now remove the sack and add enough water to bring the solution again 

 up to the fifty-gallon mark, previously made on the barrel. It will be under- 

 stood, of course, that this second adding of water is merely to replace the 

 space previously occupied by the sack and the crystals of copper sulphate. 

 Each gallon of the solution thus made will contain two pounds of copper sul- 

 phate, and, under all ordinary conditions of temperature, there will be no 

 material recrystallization, so that the stock preparation may be kept indefi- 

 nitely. 



"Stock lime may be prepared in much the same way as the copper sul- 

 phate solution. Procure a barrel holding fifty gallons, making a mark to 

 indicate the fifty-g'allon point. Weigh out one hundred pounds of fresh 

 lime, place it in the barrel and slack it. When slacked add sufficient water 

 to bring the whole mass up to fifty gallons. Each gallon of this preparation 

 contains, after thorough stirring, two pounds of lime. 



"When it is desired to make bordeaux of the fifty-gallon formula it is 

 only necessary to measure out three gallons of the copper solution, and, after 

 thorough stirring, two gallons of the stock lime ; dilute each to twenty-five 

 gallons, mix, stir, and test as already described. One test will be sufficient 

 in this case. In other words, it will not be necessary to test each lot of 

 bordeaux mixture made from the stock preparation, provided the first lot is 

 perfect, and no change is made in the quantities of the material used. 

 Special care should be taken to see that the lime milk is stirred thoroughly 

 each time before api^lying. As a final precaution it will be well to keep both 

 the stock copper sulphate and the stock lime tightly covered." 



Acknowledgements are due Dr. W. J. Beal of the Michigan Agricultural 

 College, under whose directions all of our laboratory studies of Monilio, were 

 conducted. 



