268 MONTANA EXPERIMENT STATION. 



solution is obtained, which does not become cloudy when diluted to 

 45 gallons. 



The ammoniacal solution of copper carbonate being a clear li- 

 quid its presence on the leaves, fruit, and other parts of the treated 

 plant is not so noticeable as where preparations containing lime are 

 used. 



In case it is desired to keep the strong solution as a stock pre- 

 paration, the bottle or jug in which it is placed should be tightly 

 corked." 



Copper Sulphate. 



Copper sulphate (blue vitrol or blue stone) solution is some- 

 times used in place of Bordeaux mixture. It is also used as a means 

 of destroying the spores of grain smut on seed grain, but for this 

 purpose formalin is considered to be better. 



For trees in a dormant state, use copper sulphate, i pound in 25 

 gallons of water. For trees in foliage use copper sulphate, i pound 

 in 250 gallons of water. 



Potassium Sulphide. 

 This substance, also known as liver of sulphur, may be obtain- 

 ed from almost any druggist. It is used in the proportion of one- 

 half to one ounce in one gallon of water. A stock solution may be 

 made as follows : 



Potash 32 pounds. 



Sulphur 37 pounds. 



Salt 2 pounds. 



Water 50 gallons. 



The potash, sulphur and salt are put into a large, metallic tub 

 with a part of the water; the chemical action will make the mixture 

 boil. Add the remainder of the water and set it away as a stock 

 solution, covering it to prevent evaporation. Dilute with 99 parts of 

 water before spraving. 



R. A. COOLEY. 



