16 



BTTLLETIX 1063, TJ. S. DEPARTMENT OP AGRICULTURE. 



the temperatures in the bins and of the air recorded by the 

 instruments and averaged by 2-hour periods for the years 1918-19 

 and 1919-20, respectively. The variety used was the Southern 

 Queen, and the bin contained about 75 bushels each year. The 

 average temperature in the bins was somewhat higher than that of 

 the air, and the fluctuations in temperature were less marked in 



1919 - 1920 



PERIODS OF SEVEN DAYS EACH 



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THERMOGRAPH SHEET FOR PERIOD A' B' 



Fig. 4. — Diagrams showing the temperature in the interior of the bins (solid lines) as 

 compared to the temperature of the air (broken lines) in 1919-20 at the Arlington 

 .Experimental Farm, Va. The upper diagram gives the average temperature for the 

 storage season, by weekly periods. The middle diagram gives the same data by daily 

 averages. In these diagrams each square indicates a period of seven days. The lower 

 diagram is a typical thermograph sheet, in this case for the period A'— B'. 



the bins than in the air. Some work was done in studying the 

 temperature of the bins as compared with that of standard bushel 

 crates, but owing to its incompleteness the results are not presented 

 here. In general, the temperature in the crates was about the same 

 as that of the surrounding air and somewhat lower than the tem- 

 perature of the interior of the bins. 



