220 LESSONS IN AGRICULTURE 



Shave the soap into the water and heat almost to 

 boiling. Remove the soap solution from the fire, and 

 add the kerosene. Stir the mixture into a creamy con- 

 sistency. Now dilute this mixture with two gallons of 

 water, and it is ready to apply to the foliage. This 

 mixture is called kerosene emulsion. 



Both the lime-sulphur and the kerosene emulsion de- 

 stroy the sucking insects by corroding their bodies and 

 stopping up their breathing pores. 



Problems 



1. Fifty gallons of properly diluted lime-sulphur so- 

 lution will spray about twenty young fruit trees. The 

 material for a fifty-gallon barrel will cost about $1. 

 How much will it cost to spray 100 trees? 



2. What are the proportions necessary to make up a 

 barrel of kerosene emulsion, using the same as suggested 

 in the second exercise given above? 



3. How much will it cost to spray the five acres 

 of orchard on our forty-acre farm, counting one acre 

 in peach trees and four acres in apple trees? The 

 apple trees are ten years old, and the peach trees seven 

 years old. Determine the number of trees of each that 

 should occupy the ground. 



Reference: Farmers' Bulletin, No. 127. 



