36 PLANT DISEASES 



will be also 25 cents, while the third year the cost will be 

 increased to 35 or 40 cents per 1000, making the total 

 cost of treating trees until the buds are two years old from 

 85 cents to $i per 1000. 



The net profit resulting from the work in case of the 

 pears and cherries ranged from $i to $40 per 1000 trees, 

 the average being $13 per 1000. 



In conclusion, it may be said that as a whole the 

 experiments clearly show that spraying nursery stock with 

 fungicides is thoroughly practicable ; that it results in 

 better trees ; and finally, that it yields a handsome profit. 



AMMONIACAL SOLUTION OF COPPER CARBONATE 



Water . . . . 1 6 gallons. 

 Carbonate of copper . i ounce. 

 Carbonate of ammonia . 5 ounces. 

 Mix the carbonate of copper and the carbonate of 

 ammonia, and dissolve it in about a quart of hot water. 

 When thoroughly dissolved, add 16 gallons of cold water. 



A second method of preparation, as follows, is recom- 

 mended by Professor Galloway : 



Water . . . -45 gallons. 

 Strong aqua ammonia . 3 pints. 

 Copper carbonate . . 5 ounces. 



The copper carbonate is first made into a thin paste by 

 adding a pint and a half of water. The ammonia water 

 is then slowly added, and if of the proper strength, i.e. 

 26 degrees, a clear, deep blue solution is obtained, which 

 does not become cloudy when diluted to 45 gallons. 



This preparation, being a perfectly clear liquid, can be 



