8 



BULLETIN 



IT. 5. DEPARTMENT OF AGRICULTURE. 



Heat-damaged and mahogany kernels. — Corn which, has become dis- 

 colored, as a result of heating due to fermentation or fire damage shall 

 be classed as "heat damaged." Badly discolored and darkened 

 kernels shall be classed as '"'mahogany" corn. Xo heat-damaged 

 kernels are shown in the colored plate. 



DETERMINATION OF DAMAGED CORN. 



The percentage of damage should be made on the screened sample. 

 preferably by using the entire quantity that remains after removing 

 the foreign material and "cracked" corn. In <>rd-r to simplify the 

 deter m ination for damaged corn and to avoid a double penalty, the 

 damaged "'•'cracked" corn, as used in these grades, shall be considered 

 simply as '"'cracked'"'' corn: that is, the small quantity of damaged 

 '•'cracked" corn should not be picked out after screening and classified 

 as a part of the damaged corn. An excess of damage in the "cracked" 



corn will be evidence of a will- 

 ful adulteration and a viola- 

 tion of general rule Xo. 10 of 

 the grades. 



FOREIGN MATERL4L. 



The foreign material, in- 

 cluding dirt, pieces of cob. 

 other grains, finely broken 

 corn, etc., as provided for in 

 column -A of Table I, should 

 „ . _ . . . . .. . include not onlv material that 



F ig. ?.— Immature skeleton kernels which would be JJ ~ t 

 removed bv fanning or blowing and should therefore -vvill paSS through the Sieve 

 be classified as fcreiga material. (Natural size.) ^.^ ^^ j ^ e sbdy-fourths 



of an inch in diameter, as shown in figure 6, but should also in- 

 clude the coarser foreign material, such as is shown in figure 7. 

 It will be found after a little experience that the coarse material 

 shown in figure 7 can be taken out very quickly by hand picking 

 after the finer material has been removed by screening, whenever such 

 hand picking is necessary to determine correctly the grade of the 

 grain in question. 



CRACKED CORN. 



As provided for in general rule No, 9, all coarsely broken pieces of 

 kernels that will pass through the metal sieve perforated with round 

 holes one-quarter of an inch in diameter (first sieve) and are re- 

 tained on the sieve with the smaller perforations (second sieve 

 shall be considered as •''cracked'' corn, as shown in figure 8. More- 





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