26 BULLETIN 579, U. S. DEPARTMENT OF AGRICULTURE. 
In most storage houses the temperature is recorded by means of 
thermometers placed a few feet from the floor. These do not show 
.the temperature near the ceiling. 
In many instances, when the thermometers register 32° F. within 
4 feet of the floor the temperature is 35° to 36° F. near the ceiling. 
Thermometers should be placed at various heights in the storage 
room and in the corners as well as in the passageways. When there 
is much variation in temperature in different parts of the room the 
air should be set in motion. 
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