2 BULLETIX 168, U. S. DEPARTMENT OF AGEICULTUEE. 
(5) In addition to the various limits indicated, No. 6 corn may be musty, sour, 
and may also include that of inferior quality, such as immature and badly blistered 
com. 
(6) All com that does not meet the requirements of either of the six numerical 
grades by reason of an excessive percentage of moisture, damaged kernels, foreign 
matter, or "cracked" com, or com that is hot, heat damaged, fire burnt, infested 
with live weevils, or otherwise of distinctly low quality shall be classed as sample 
grade. 
(7) In Xo. 6 and sample grades, the reasons for so grading shall be stated on the 
inspector's certificate. 
(8) Finely broken corn shall include all broken particles of corn that will pass 
through a metal sieve perforated with round holes nine sixty-fourths of an inch in 
diameter. 
(9) "Cracked" com shall include all coarsely broken pieces of kernels that will 
pass through a metal sieve perforated with round holes one-quarter of an inch in 
diameter, except that the finely broken corn, as provided for under rule No. 8, shall 
not be considered as "cracked" corn. 
(10) It is understood that the damaged com, the foreign material (including dirt, 
pieces of cob, finely broken com, other grains, etc.), and the coarsely broken or 
"cracked" com, as pro\T.ded for under the various grades, shall be such as occur 
naturally in corn when handled under good commercial conditions. 
(11) Moisture percentages, as pro%'ided for in these grade specifications, shall con- 
form to results obtained by the standard method and tester described in Circular 
No. 72, Bureau of Plant Industry, U. S. Department of Agriculture. 
HOW THE VARIOUS FACTORS SHOULD BE DETERMINED. 
In order that producers, dealers, and consumers throughout the 
United States may fully understand the correct interpretation of 
the Government corn grades, somewhat detailed explanations are 
given in the following pages. 
In the practical appjication of these grades it is fuUy appreciated 
that even with definite limits for the more important factors points 
will arise on which the best of experts may differ. For example, 
there are all degrees of damage and wide variations in color, so that 
some arbitrary line must be drawn as to what shall be considered as 
commercially sound or what shall be considered as white or as yel- 
low. Similar conditions exist on other points. It is believed, how- 
ever, that by the honest adherence to the instructions which follow 
differences in grading will be reduced to a minimum and that the 
grades can be uniformly applied throughout the United States. 
While these explanations are given somew^hat in detail and definite 
limits have been fixed for the more important factors, it is not con- 
templated that actual determinations shall be made in the grading 
of every lot of commercial corn. In a large number of cases a com- 
petent and experienced inspector or grader, after he has once become 
familiar with the various limits fixed and established in these 
grades, can estimate the percentage of the various factors with suffi- 
cient accuracy to determine the grade thereof on the basis of his 
judgment. 
