10 



BULLETIN 215, U. S. DEPARTMENT OF AGRICULTURE. 



acidity in the meal requires explanation. That the acidity of both 

 corn and freshly ground meal would be the same is obvious, but the 

 increase in the meal is much more rapid than in the corn. In cases 

 where the acidity of the meal is in excess the cause is directly trace- 

 able to delay in delivery of the samples, which in some instances 

 was a week or more. Experience shows that corn will not materially 

 increase in acidity during that time. 



The acidity given in Table 2 for the corn should in all cases be 

 taken as that of the corresponding meal at the time of grinding. 



The excessive amount of acidity in some of the samples of meal 

 when analyzed merely illustrates the difficulty in keeping meal of 

 this type, which fact is further brought out by the results of the later 

 experiments. (See Tables 12 and 14.) 



BOLTED UNDEGERMINATED MEAL. 



Results obtained in the analysis of bolted, undegerminated meal, 

 as well as of the corn from which it was milled, appear in Table 3. 

 The mills in which the corn was ground are all located in the South 

 except No. 18, which is in Iowa, and No. 35, which is in Rhode 

 Island. In most of the mills grinding was done by stones; in Nos. 

 18, 36, 37, and 38, however, rolls were used. The corn ground in 

 all the southern mills was white dent, in the Iowa mill it was yellow 

 dent, and in the Rhode Island mill it was white flint. 



Table 3.- — Composition of bolted, undegerminated corn meal and of corn from zvhich 



meal was milled. 



Product. 



Analysis as received. 



Analysis calculated to moisture-free 

 basis. 



White corn and meal: 

 Mill No. 1, Alabama — 



Corn, Middle West.. 



Meal, bolted 



Mill No. 4, Georgia — 



Corn 



Meal, bolted 



Mill No. 34, Georgia- 

 Cora 



Meal, bolted 



Mill, No. 5, Georeia— 



Corn, Middle West. . 



Meal, bolted 



Mill No. 21, Missouri — 



Corn, Middle West.. 



Meal, bolted 



MillNo. 9, Mississippi — 



Corn, Kentucky 



Meal, bolted 



Mill No. 35, Rhode 

 Island— 



Corn, R. I. flint 



Meal, bolted 



P.ct. 

 13.05 

 14.94 



13.99 

 12.60 



12.79 

 11.32 



14.04 

 11.60 



14.87 

 12.78 



12.54 

 12.45 



12.93 

 10.12 



32.0 

 33.8 



25.4 

 27.7 



23.5 

 26.2 



23.0 

 25.5 



25.8 

 24.1 



30.0 



44.5 



22.5 

 21.7 



P.ct. 

 8.47 



7.75 



8.81 

 9.09 



8.93 

 9.22 



8.59 

 8.87 



8.75 

 8.97 



9.22 



9.06 



9.50 

 8.97 



P.ct 

 3.70 

 2.92 



3.78 

 3.72 



4.30 

 4.35 



3.55 

 3.78 



3.58 

 3.04 



4.24 



4.72 



4.47 

 4.83 



P.ct 

 71.49 

 72.53 



70.19 

 71.94 



70.62 

 72.12 



70.54 

 72.77 



69.47 

 72.92 



70.73 



70.88 



69.94 

 73.39 



P.ct 

 2.00 

 .83 



1.95 

 1.48 



2.06 



1.64 



2.04 

 1.68 



1.99 

 1.17 



1.91 

 1.38 



1.83 

 1.31 



P.ct 

 1.29 

 1.03 



1.28 

 1.17 



1.30 

 1.35 



1.24 

 1.30 



1.34 

 1.12 



1.36 

 1.51 



1.33 

 1.38 



36. S 

 29.8 



29.5 

 31.7 



26.9 

 29.6 



26.8 

 28. 8 



30.3 

 27.6 



34.3 

 50. S 



25.8 

 24.2 



P.ct 

 9.74 

 9.11 



10.24 

 10.40 



10.24 

 10.39 



10.00 

 10.04 



10.28 

 10.28 



lO.^ 

 10.35 



10.91 

 9.98 



P.ct. 

 4.26 

 3.43 



4.40 

 4.26 



4.93 

 4.90 



4.13 

 4.27 



4.20 

 3.49 



4.85 

 5.39 



5.13 

 5.38 



P.ct 

 82.22 

 85.27 



81.61 

 82.30 



80.98 

 81.34 



82.06 

 82.32 



81.62 

 83.61 



80.87 

 80.96 



80.33 

 81.64 



P.ct. 



2.30 



.98 



2.26 

 1.70 



2.36 

 1.85 



2.37 

 1.90 



2.34 

 1.34 



2.19 

 1.58 



2.10 

 1.46 



P.ct. 

 1.48 

 1.21 



1.49 

 1.34 



1.49 

 1.52 



1.44 

 1.47 



1.56 

 1.28 



1.55 

 1.72 



1.53 

 1.54 



