99 
BULLETIN 102, TJ. S. DEPARTMENT OF AGRICULTURE. 
Heretofore in commercial grading, corn has been considered out 
of condition because of unnatural odor only when the odor is suffi- 
ciently pronounced to be readily detected by the sense of smell, 
which varies with different individuals and even with the same indi- 
vidual under different conditi os. 
In the grading of corn from the standpoint of quality or soundness, 
however, the methods are entirely arbitrary, inasmuch as there is 
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Fig. 19a. — 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 (D), by months, from October, 1911, 
to August, 1912, inclusive. 
always considerable question as to just what constitutes cob-rotten, 
decayed, or otherwise damaged and defective kernels in any given 
sample which may be under inspection. 
It is the purpose of this section of this report to show the relation 
of degree of acidity in a detailed way to acknowledged criteria of 
soundness and quality of corn and to call to the attention of the 
grain trade and those of the general public who may be interested 
