VEGETABLE STORAGE HOUSES 



307 



to fourteen inches thick is built up; or a double wall may be built 

 with the two parts twelve inches apart, and the intervening space 

 filled with sawdust or other material that is a poor conductor of 



Fig. 183. — Outdoor cellar for storage of \><>VA\(,r<, near (IroclcN , Colorado. 



Fig. 184. — Storase hou.se for sweet potatoes. Union County, Illinois. 



heat. In this case, also, the wall is lined with paper to make the 

 insulation perfect. In both cases it is customary to use matched 

 lumber in the construction of the walls. 



