18 



FUXGI AXD FUXGICTDES 



adding one quart of ammonia and mixing with fifty or 

 sixty gallons of water. 



Modified Eau Celeste. — Dissolve four pounds of 

 sulphate of copper in ten or twelve gallons of water ^ 

 and stir in five pounds of washing or sal soda ; dissolve 

 one and one-fourth pounds of sal soda in hot water^ 

 then add three pints of ammonia and dilute to fifty gal- 

 lons of water. 



Carbonate of Copper. — This is commonly used 

 in the form of an ammoniacal solution^ made by dissolv- 

 ing four ounces of carbonate of copper in two quarts of 

 ammonia^ and then adding to a barrel of water. The 

 carbonate wdll dissolve more readily if mixed with water 

 enough to form a paste before it is added to the ammo- 

 nia. It is a simple fungicide, easy to make and apj^ly. 

 and as it is a clear solution there is no trouble with its 

 clogging nozzles. It has been successfully used to pre- 

 vent apple scab, various mildews, etc. 



Inasmuch as commercial copper carbonate is rather 

 expensive, costing thirty-five to forty cents per j^ound 

 at wholesale, Professor F. D. Chester advises that it 

 be prepared at home according to the following method, 

 in whicli case it costs, for materials, but fourteen cents 

 per pound : 



Dissolve in a barrel twenty-five pounds of copper 

 sulphate in hot water. In another barrel dissolve thirty 

 pounds of sal soda in hot water. Allow both solutions 

 to cool, then slowly pour the solution of sal soda into 

 the copj)er sulphate solution, stirring the same. Fill 

 the barrel with water and allow the precipitate of copper 

 carbonate to settle. Upon the following day siphon off 

 the clear supernatant liquid, which contains m.ost of the 

 injurious sodium sulphate in solution. Fill the barrel 

 again with water, and stir the precipitate vigorously 

 into suspension ; again allow the precipitate to settle, 

 and again on the following day siphon off the clear 



