Materials and Formulas. 159 



Churn thoroughly until a pasty emulsion is formed. Dilute 

 with from 12 to 24 gallons of water. The remedy has not yet 

 been thoroughly tested. 



LIVER OF SULPHUR. See POTASSIUM SULPHIDE. 



LONDON PURPLE. See under ARSENITE OF LIME. 



LYE. The success following the use of soaps for destroying 

 insects has lead to treatments of lye for the same purpose. It 

 may be used as follows : 



Concentrated lye 1 pound. 



Water 3 gallons. 



One and one-fourth pounds of potash may be used in place 

 of the lye. These solutions are very caustic, and should only 

 be used upon dormant wood. They are especially useful in 

 destroying scale insects, but soft-bodied insects may also be 

 exterminated by using : 



Concentrated lye 1 pound. 



Water 40 gallons. 



It is well to wash this solution from delicate foliage in the 

 course of half an hour, to prevent any injury which might 

 follow if the insecticide were allowed to remain. 



LYE AND SULPHUR WASH. 



Concentrated lye 1 pound. 



(Potash 14 pounds.) 



Sulphur \\ pounds. 



Water 3 gallons. 



This is recommended for the destruction of scale insects, but 

 should be used only upon dormant wood. 

 LYE AND WHALE-OIL SOAP WASH. 



(a) Concentrated lye 1 pound. 



Water 1 gallon. 



Sulphur Is pounds. 



Boil until all the ingredients are dissolved. 



(6) Whale-oil soap 14 pounds. 



Water 54 gallons. 



