2 BULLETIN 168, U. S. DEPARTMENT OF AGRICULTURE. 



(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 

 corn. 



(6) All corn 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" corn, or corn 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" corn 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 corn, the foreign material (including dirt, 

 pieces of cob, finely broken corn, other grains, etc.), and the coarsely broken or 

 "cracked" corn, as provided for under the various grades, shall be such as occur 

 naturally in corn when handled under good commercial conditions. 



(11) Moisture percentages, as provided 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 hi the following pages. 



In the practical application of these grades it is fully 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 somewhat 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. 



