18 
BULLETIN 102, U. S. DEPARTMENT OF AGRICULTURE. 
heat. The curve designated ''cob rot plus heat damage'' (broken 
hue) represents the percentage of the total of the damaged kernels. 
The curves show that the samples which were found by analysis 
to have a large percentage of damaged kernels were also found to 
have a high degree of acidity. It is shown further that the degree 
of acidity varies directly with the percentage of damaged kernels 
and that the presence of heat-damaged kernels in any large amount 
tfC/D/TY-c.c. 
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31 
36 
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32 
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29 
29 
21 
26 
25 
eq 
23 
22 
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20 
IS 
16 
n 
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15 
14 
fS 
12 
// 
fO 
9 
3 
7 
6 
5 
4 
3 
2 
Fig. 15.— Curves showing the relation of damaged kernels to the degree of acidity found in samples of 
corn (all grades) representing 2,4.54 cars received at a principal terminal market (C) from December, 
1011, to May. 1913, inclusive. 
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greatly increases the degree of acidity. When the percentage cf 
heat-damaged kernels was small, the degree of acidity was only 
slightly increased. A break occurs in the continuity of the curves 
representing the percentages of damaged kernels at acidity ranges 
between 27.1 and 31 c. c. This break shows that a number of the 
samples, although having a slightly higher degree of acidity than 
certain other samples, contained a smaller percentage of damaged 
