94 STATE POMOLOGICAL SOCIETY. 



bonate of copper, stir rapidly for a moment, and the carbonate of 

 copper will dissolve in the ammonia, forming a very clear liquid. 

 For use, dilute to twent3'-two gallons. 



(4) eau celeste. 



(a) Dissolve one pound of sulphate of copper in two gallons of 

 hoi water ; when completely dissolved, and the water has cooled, 

 add one and a half pints of commercial ammonia (strength 22*^ 

 Baume), when ready to use dilute to twenty-two gallons. 



(6) Dissolve two pounds of sulphate of copper in two gallons of 

 hot water ; in another vessel dissolve two and a half pounds of car- 

 bonate of soda ; mix the two solutions, and when all chemical reac- 

 tion has ceased add one and a half pints of ammonia, then dilute to- 

 twenty-two gallons. 



The strength of the above solutions can be modified by adding 

 more or less water, and arsenical compounds may be added to des- 

 troy insects. 



