4 BULLETIN 1063, U. S. DEPARTMENT OF AGRICULTURE. 
of doors and windows. During the curing period all ventilators 
were kept open. During the day the windows and doors also re- 
mained wholly or partially open unless the weather was cold or the 
atmosphere was very moist. By means of heat and ventilation, 
moisture was prevented from depositing on the interior of the stor- 
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Fig. 1. — Diagrams showing the average temperature in the storage house at the Arling- 
ton Experimental Farm. Va. 
age house. During rainy or cold weather the doors and windows of 
the house were kept closed. 
Temperature and moisture variations in the experimental storage 
house were recorded by means of thermographs and hygrothermo- 
graphs. These instruments were standardized by comparison be- 
