ACIDITY IN DETERMINING SOUNDNESS OF CORN. 
23 
the possibilities of the acid test as an additional criterion in deter- 
mining soundness and quality of corn from the standpoint of com- 
mercial grading. 
The samples shown in Tables XII to XIX and figures 20 to 31 and 
33 were graded by the Illinois State Grain Inspection Department 
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Fig. 19&. — 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 September, 1912, 
to June, 1913, inclusive. 
according to the rules governing the grading of grain in the years 1912 
and 1913. 
Figure 20 shows the average degree of acidity of Nos. 2, 3 ; 4, and 
sample-grade corn as it was graded upon arrival at a principal ter- 
minal market (C), representing an average of approximately 2,000 
cars received from December, 1911, to December, 1912, inclusive. 
Very little difference is shown between the grades 2, 3, and 4. This 
