AGRICULTURAL EXPERIMENT STATION. 117 



ready for use, add 1 1-2 pints strong ammonia water and dilate 

 the whole to 28 gallons. The sulphate of copper should he dis- 

 solved in a wooden vessel as zinc or iron will corrode. 



It is well to make the stock solution at least one day before it 

 is wanted for use, and to mix a considerable quantity, merely 

 observing the proportions suggested. 



Solution B. — Ammoniacal Solution of Copper Carbonate. 



The formula used in most of our work was as follows : 

 3 oz. copper carbonate. 

 1 qt. ammonia. 

 30 gal. water. 

 Dissolve the carbonate of copper in the ammonia and when 

 ready for use add to the required amount of water. As with the 

 eau celeste, the solution should be made several hours before 

 desired for use. 



The ammonia used in our work was nearly 26° Baume (sp. 



grav. ) ; and in some instances the foliage was injured. In 



the later applications the solution was diluted to 35 gallons, and 

 it is probable that 40 gallons would be better. 



It was found that only about 1 1-2 ounces of the copper car- 

 bonate would dissolve in one quart of ammonia ; still better 

 results were obtained from the use of the 3 ounces than from 

 solution C, in which only 2 ounces copper was used in a quart of 

 ammonia. Why this is so is not clear, since the simple copper 

 carbonate in suspension appeared to have no value. 



An improved formula for the ammonio-copper carbonate solu- 

 tion has been recommended. It is as follows : 

 3 oz. carbonate of copper. 

 1 lb. carbonate of ammonia. 

 50 gal. water. 

 Mix the carbonate of copper and the carbonate of ammonia 

 thoroughly, and dissolve the mixture in two quarts of hot water. 

 This solution may then be added to the full amount of water ; or 

 a considerable quantity may be prepared and used as a stock 

 solution. 



Solution D, copper carbonate in suspension, is not a true solu- 

 tion, as the copper carbonate is not soluble in water. It is made 

 by adding a given amount of the copper salt to the water and, 

 as in the case of Paris green, the particles are held in suspension 



