30 



lowing method of making is recommended : A barrel is partly filled with 

 water and 25 pounds of copper sulphate are dissolved in it and into this 

 is poured a solution of 30 pounds of sodium carbonate (common washing 

 soda) when the copper is thrown down as a pale green precipitate of 

 'basic" copper carbonate. This precipitate rapidly settles to the bottom 

 and after a time the clear solution above can be siphoned off. The barrel 

 is filled with water again, the precipitate stirred up and allowed to settle, 

 and the clear solution again drawn off. This washing removes the 

 greater part of the impurities (sodium sulphate) and leaves behind about 

 12 pounds of basic copper carbonate. This can be removed from the 

 barrel and dried in the air, after which it is ready for use. 

 The following quantities can be used for spraying : 



Copper carbonate 1 pound. 



Water 4° gallons. 



Ammonical Copper Carbonate. 



This spray is made from basic copper carbonate the preparation of 

 which has just been outlined under "copper carbonate." When ammonia 

 is added to this material, it dissolves to form a deep blue solution, and 

 this solution diluted with the requisite quantity of water forms the well- 

 known spraying compound. 



This fungicide is of use in that it can be applied to trees when the 

 fruit is well advanced in the stage of maturity without causing any dis- 

 figurement, such as would result from the employment of Bordeaux. 

 This last material leaves a coating if sprayed just a short time before 

 the fruit is picked, which does not enhance marketing qualities, and 

 which, further, might cause poisoning. 



Following are the quantities of material to use : 



Copper carbonate 5 ounces. 



Ammonia (sp. gr. 26 Beaume) 3 pints. 



Water 45 gallons. 



Eau Celeste. 



The name of this material indicates that it was .originated in France, 

 and it was there, in 1885, it first came into use. It has decided action 

 against fungi, but it exerts quite a caustic action on foliage, and for this 

 reason cannot be much recommended. It is made in the following way : 



Copper sulphate 1 pound. 



Hot water 2 gallons. 



When the crystals are dissolved and the liquid has cooled, add : 



Ammonia (sp. gr. 22 Beaume) i\ pints. 



Water, to make 25 gallons. 



When the ammonia is first added a precipitation occurs, but on the 

 addition of the excess this precipitate disappears and a deep blue solu- 

 tion results. 



