A Consideration of Adverse Temperatures 337 



inefficient and equipped their grove with a large reservoir 

 type each holding seven gallons of oil, representing an in- 

 vestment in equipment and supplies of $180 an acre and an 

 estimated annual acre charge for interest, upkeep, deteriora- 

 tion, and the like of $33 an acre. However, the margin 

 of profit in this case was believed to justify the cost of this 

 form of crop insurance. 



