22 BULLETIN" 215, U. S. DEPARTMENT OF AGRICULTURE. 



COMPARATIVE KEEPING QUALITY OF WHOLE-KEPNEL STONE-GROUND 

 MEAL AND DEGERMINATED BOLTED ROLLER-GROUND MEAL. 



In this investigation a comparison in regard to fat content was 

 made of the keeping quality of meal of the extreme types, ground 

 from the same corn and containing practically the same amounts of 

 moisture. The experiments were carried out in two series, the first 

 with meal milled in December, in parallel lots, dried to different de- 

 grees so as to contain from less than 11 to over 19 per cent of mois- 

 ture, the second with meal ground in April without drying. 



The whole-kernel meal was ground in an under-runner bevel 

 mortise-geared buhr mill which was set up for the purpose at the 

 Terre Haute plant of the American Hominy Company. The mill was 

 adjusted to yield a fine, soft meal, such as is preferred by the southern 

 trade, nothing being added to the corn and nothing taken away. 

 The degerminated meal was the usual somewhat granular product of 

 the mill known in the trade as "cream meal." The corn used was 

 No. 3 white dent of the crop of 1913. The quality was quite poor, 

 much inferior to that of the preceding year, which was exceptionally 

 good. It thus appears that in the experiments of the two years the 

 extremes in quality were encountered. 



. In all the experiments the stream of cleaned corn was divided, part 

 going to the roller system and part to the buhr stones. The bags that 

 received each kind of meal were numbered consecutively and the pro- 

 cess so regulated that the meal of the two kinds in bags bearing the 

 same number was from the same corn. As the capacity of the buhr 

 mill was much less than that of the roller system it was necessary to 

 draw the corn for the whole-kernel meal from the divided stream into 

 bags arranged in the proper order and continue the grinding, after 

 the cream meal was milled and sacked. 



As in the experiments of the preceding year, it was impracticable 

 to mix all of the meal in each lot. Accordingly ton portions were 

 taken out, mixed, analyzed, and bagged in specially marked sacks, 

 one of which was used for the tests at the end of each storage period. 

 Care was taken that these sublots for sampling, representing the two 

 kinds of meal of the same moisture content, were from the bags bear- 

 ing the same numbers and therefore were comparable not only as to 

 moisture, but also as to corn. 



STORAGE EXPERIMENTS WITH PARALLEL LOTS OF WHOLE-KERNEL AND DEGERMI- 

 NATED MEAL, OF DIFFERENT DEGREES OF DRYNESS. MILLED DECEMBER, 1913. 



DESCRIPTION AND ANALYSES OF THE MEAL AS MILLED. 



This experiment involved the serious difficulty of drying both 

 kinds of meal of each pair of the series so that they should be alike 

 as to corn and moisture. As the drying apparatus of the stone sys- 

 tem differed from that of the roller system in kind and capacity, it 



