ACIDITY IN" DETERMINING SOUNDNESS OF CORN. 
21 
oats or wheat; musty, sour, or sweet; damp, wet, or dry. The word 
"quality/' then, in connection with grading of corn, must refer to 
soundness, meaning freedom from injury, defect, or decay, i. e., 
normally perfect of its kind. 
Of the factors affecting the condition of corn, viz, dirt, cob, broken 
kernels, other grains, unnatural odor, and moisture, all with the 
W 
AC/ZD/ry^-c^. cr: 
G&PM/AJ47-/C>/V—0£-/?C£nT* 
. E~V.,„,, ' ,,; „ ,,, ' \23-?l 
@»^<fX , , .,,,., \2 /&~ 
Fig. 18.— 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 (C), by months, from December, 1911, 
to May, 1913, inclusive. 
exception of odor can be definitely ascertained by practical and 
quantitative methods. The exact percentage of dirt, cob, broken 
kernels, and other grains can be readily determined by mechanical 
separations; the percentage of moisture can be as readily determined 
by the use of a moisture tester. 1 
1 Duvel, J. W. T. A moisture tester for grain and other substances and how to use it. U. S. Depart- 
ment of Agriculture, Bureau of Plant Industry Circular 72, 15 p., 13 fig., 1910. 
