94 MODERN FRUIT MARKETING 
low temperature is more important than any other single 
consideration. 
In the various types of storages three methods are em- 
ployed to regulate the temperature: (1) Ventilation. 
(2) Ice refrigeration. (3) Mechanical cooling appli- 
ances. The first, ventilation, is applicable to the small 
cold storage cellars in the Northern states or to the dug- 
out previously referred to. Ice refrigeration is used 
mainly in the smaller storage and in the North for the 
larger ones. Mechanical refrigeration is used almost 
entirely in the South and in the larger public storages 
of the Northern and Eastern states. The cost of installa- 
tion between the ice and mechanical methods is consid- 
erably greater for the latter. For small storage houses 
up to 5,000 barrel capacity ice would probably be the 
cheaper. Above that quantity the consensus of opinion 
among storage-house men is in favor of the mechanical 
refrigeration. 
Construction.—The materials from which a storage 
house can be built are numerous. For the cellars con- 
structed under ground, some form of the common hard 
building materials is used, such as stone, brick, cement, 
hollow building tile, ete. Of these the cement and brick 
are more commonly used. Hollow building tile, a burned 
clay. product resembling brick, is coming rapidly into 
importance, and is considered more economical and a 
better protection against outside cold. For the part 
above ground, various materials are used for insulating 
the houses against the cold or heat from the outside. 
Wood is most commonly used, and for insulating pur- 
poses such material as building paper, sheet cork, felt, 
