ACIDITY IN DETERMINING SOUNDNESS OF CORN. 
19 
kernels. The difference, however, is small, being only 2.5 per cent, 
and this evidence should in no way discredit the merits of the acid 
test. It must be remembered that, theoretically, the degree of 
acidity of corn is a measure not only of the amount or quantity of 
damage but that it is also a measure of the quality or degree of. 
damage in any given sample. Hence, it can be readily understood 
how a sample containing 10 per cent of damaged kernels might have 
a higher degree of acidity than a sample containing 15 per cent of 
damaged kernels, provided the degree of damage or the extent to 
which the kernels were damaged is taken into consideration. This 
factor of degree or state of damage, or stage of deterioration, while 
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Fig. 16. — Graphic comparison of the average degree of acidity and the average percentage of germination 
for each commercial grade of corn received at a terminal market (A), by months, from January to June, 
1912, inclusive. 
immeasurable by the eye in any standard or definite way, is readily 
determined by the acidity test. 
RELATION OF ACIDITY AND GERMINATION OF CORN TO COMMERCIAL 
GRADING AT TERMINAL MARKETS. 
The purpose in presenting figures 16, 17, 18, 19a, and 19b is to corre- 
late the average degree of acidity and the average percentage of 
germination of corn with the commercial grading at terminal mar- 
kets by months. Attention is called to the increase in the degree 
of acidity and the decrease in the percentage of germination from 
the high to the lower grades. Attention is also called to the de- 
crease in degree of acidity and the marked increase in the percentage 
of germination upon the arrival of the new crop in November, as 
shown in figures 17, IS, 19a, and l,9o. 
ACIDITY OF CORN AS A FACTOR IN COMMERCIAL GRADING. 
ACIDITY OF COMMERCIAL GRADES. 
Corn arriving at a terminal market is graded or classified accord- 
ing to its condition and quality. In this connection the words "con- 
dition" and "quality" are more or less synonymous. It is generally 
