70 SUCCESSFUL I'UUIT CULTUKE 



' ductor and will prevent the decay of the woodwork. 

 One thickness of building paper to each sheathing 

 should be used if there are four or more air spaces and 

 two thicknesses if there are less than four air spaces. 

 The best results will not be obtained, however, unless 

 the walls are at least two feet in thickness, and with 

 four or more spaces. All doors and windows must be 

 made with two or more thicknesses, and all joints to 

 fit closely. 



The use of chemicals for lowering the temperature 

 can only be profitably employed where large quantities 

 of fruit or other produce are to be stored. Such houses 

 are generally located in large business centers, the 

 produce shipped directly from the grower and is then 

 kept until being sold. As fruit does not generally keep 

 as well after having been in cold storage as when fresh 

 from the grower, this method is not very serviceable, 

 except to the large grower or dealer. 



For insects and diseases attacking the apple see 

 Chapters XX and XXI. 



