2-4 
BULLETIN 102, U. S. DEPARTMENT OF.; AGRICULTURE. 
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 Xo. 2. Figure 20 also shows the average 
degree of aciditv of 
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DEC./, /9// 
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DEC 3 1, /9/2. 
N?2 
N?3 
SAMPLE 
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Af?3 
SAMPLE 
\20 cc. 
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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. 
samples received from 
April 1, 1912, to Oc- 
tober 31, 1912, inclu- 
sive . This is the t ime 
of the year during 
which corn arrives at 
terminal markets in a 
drier condition and is 
graded prin cip all y 
froni 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 Xos. 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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Figure 2 1 shows the FlG ' 21 -— Graphic comparison of the average degree of acidity of 
& n _ . , mechanical separations of samples of corn as received at a principal 
average degree oi acid- 
terminal market (C) through different seasons: (1) December, 
1911, to May, 1912; (2) December, 1911, to December, 1912; (3) 
January, 1913, to May, 1913. 
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 1911 
and the crop of 1912, based on terminal-market receipts from Janu- 
