GRADES FOE COMMERCIAL CORX. 



9 



Fig. C— Foreign material, including dirt, chaff, other grains, finely 

 broken corn, etc., which will pass through the sieve with the smaller 

 perforations, nine sixty-fourths of an inch in diameter. (Natural 

 size.) 



over, this is the only broken corn which should be so classified in 

 these grades. The finely broken pieces which will pass through the 

 sieve with the smaller perforations should be classed with the for- 

 eign material, and the large pieces which remain on the sieve with 

 the qu arter-inch holes 

 should be classed with 

 the whole kernels. 



However, it is not 

 intended that all ma- 

 terial remaining on 

 the sieve with the 

 smaller holes shall be 

 classed as ' c cracked ' ' 

 corn. All small whole 

 kernels, such as those 

 that are shown in 

 figure 9, which will 

 go through the sieve 

 with the quarter-inch 

 holes should be picked 

 out after screening and classed as whole corn. Likewise, any "other 

 grains/' pieces of cob, or other foreign material remaining with the 

 "cracked" corn on the sieve with the smaller holes should be picked 

 out and added to the foreign material, dirt, etc. In applying these 



grades, no separation 

 should be made of 

 the sound and the 

 damaged "cracked" 

 corn, but the whole 

 should be classed only 

 as "cracked" corn. 



COLOR. 



Color determina- 

 tions should be made 

 on not less than 100 

 grams of the screened 

 sample; that is, after 

 the "cracked" corn 

 and foreign material 

 have been removed. All grades of white corn require that at least 

 98 per cent, by weight, shall be white, as stated in general rule 

 No. 2, and aU grades of yellow corn require that at least 95 per 

 cent shall be yellow, as provided hi general rule No. 3. In most 



Fig. 7.— Coarse material, which will not pass through the sieve with 

 the smaller perforations, nine sixty-fourths of an inch in diameter, 

 but which should be picked out of the sample and included with the 

 foreign material, dirt, cob, other grains, etc. (Natural size.) 



