24 



BULLETIN 102, U. S. DEPARTMENT OF AGRICULTURE. 



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Fig. 20. — Graphic comparison of the average degree of acidity of 

 corn, by grades, as received at a principal terminal market (C) 

 through different seasons: (1) December, 1911, to December, 1912; 

 (2) April, 1912, to October, 1912; (3) January, 1913, to May, 1913. 



is due to the fact that the greater part of the corn that graded 3 and 

 4 was so graded because of excessive moisture, although sound and of 

 quality good enough for No. 2. Figure 20 also shows the average 



degree of acidity of 

 samples received from 

 April 1, 1912, to Oc- 

 tober 31, 1912, inclu- 

 sive. This is the time 

 of the year during 

 which corn arrives at 

 terminal markets in a 

 drier condition and is 

 graded principally 

 from the standpoint 

 of quality and sound- 

 ness. It will be seen 

 that the degree of 

 acidity increases directly with the lowering of the grades. Figure 20 

 further shows the average degree of acidity of samples received from 

 January 1, 1913, to May 31, 1913, inclusive. Increase in acidity is 

 shown through the lower grades, and uniformly lower acidity was 

 found in ISTos. 2, 3, and 

 4 corn of the crop of 

 1912 than was found 

 in samples from the 

 crop of 1911. This 

 comparison by crop 

 years will appeal to 

 those who may recall 

 the far superior quali- 

 ty and condition of the 

 crop of 1912 as it was 

 marketed over that of 

 the crop of 1911. 



ACIDITY OF MECHANICAL 

 SEPARATIONS OF CORN. 



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Fig. 21. — Graphic comparison of the average degree of acidity of 

 mechanical separations of samples of corn as received at a principal 

 terminal market (C) through different seasons: (1) December, 

 1911, to May, 1912; (2) December, 1911, to December, 1912; (3) 

 January, 1913, to May, 1913. 



Figure 2 1 shows the 

 average degree of acid- 

 ity of separations re- 

 sulting from mechan- 

 ical analyses of samples of corn representing approximately 3,000 

 cars received at a terminal market. It also represents the crop of 191 1 

 and the crop of 1912, based on terminal-market receipts from Janu- 



I 



