414 STATE HORTICULTURAL SOCIETY. 



1. — Bordeaux Mixture. 



In a barrel that will hold 45 gallons, dissolve 6 pounds of copper sul- 

 phate, using 8 or 10 gallons of water or as much as may be necessary for 

 the purpose. In a tub or half barrel slake 4 pounds of fresh lime. When 

 completely slaked add enough water to make a creamy whitewash. Pour 

 this slowly into the barrel containing the copper-sulphate solution, using 

 a coarse gunny sack stretched over the head of the barrel for a strainer. 

 Finally fill the barrel with water, stir thoroughly, and the mixture is ready 

 for use. Prepared in this way the cost of 1 gallon of the mixture will not 

 exceed 1 cent, the price of copper sulphate being 7 cents per pound and 

 lime 30 cents per bushel. In all cases it is desirable to use powdered 

 copper sulphate, as it costs but little more and dissolves much -aore readily. 

 It is highly important also that fresh lime be used. 



It will be seen by those familiar with former suggestions made by the 

 department that the strength of this mixture has been diminished one half. 

 It was found as the result of experiments made in 1891 that a mixture of 

 this strength, and even much weaker, gave practically as good results as 

 the old formula, which required 6 pounds of copper sulphate and 4 pounds 

 of lime to 22 gallons of water. 



2. — Ammoniacal Solution of Copper Carbonate. 



In an ordinary water pail mix 5 ounces of copper carbonate with enough 

 water to make a thick paste. Dissolve this paste in three pints of strong 

 aqua ammonia; then dilute to 45 gallons. If three pints of ammonia are 

 not sufficient to dissolve all the paste add enough to bring about this result. 

 Copper carbonate occurs in the market in the form of a fine greenish pow- 

 der. The retail price is usually 60 cents per pound. Aqua ammonia 

 having a strength of 2fi° retails at 8 cents per pound. Upon this basis 1 

 gallon of the ammoniacal solution of copper carbonate will cost one cent. 



In view of the fact that copper carbonate is sometimes difficult to obtain 

 the following directions for manufacturing it are given: 



In a half-barrel, or some similar vessel, dissolve 3 pounds of copper sul- 

 phate in 2 gallons of hot water. In another vessel dissolve 3^ pounds of 

 common washing soda or sal soda in 1 gallon of hot water. AVhen cool 

 pour the second solution slowly into the first; then as soon as all action 

 has ceased add enough water to bring the whole up to 8 or 10 gallons and 

 stir thoroughly. In twenty-four hours pour off the clear liquid, taking- 

 care not to disturb the sediment. Add fresh water and stir again. Again 

 allow the solution to stand twenty-four hours, pour off the clear liquid as 

 before; then remove the sediment which is copper carbonate. Prepared in 

 this way there is formed 1^ pounds of copper carbonate at an expense for 

 materials of approximately 18 cents per pound. The copper carbonate 

 paste may be immediately dissolved in aqua ammonia, using 2 gallons of 

 the latter, or as much as may be necessary for the purpose. This concen- 

 trated fluid should be kept in well corked jugs and when ready for use 

 should be diluted at the rate of 1 pint to 12 gallons of water. 



3—Eau Celeste. 



Dissolve 2 pounds of copper sulphate in 8 gallons of water. When 

 completely dissolved add 3 pints of strong ammonia and dilute to 45 gal- 



