BULLETIN OF THE BUSSEY INSTITUTION. 29 
ration as the grain is heated between the mill-stones amounts on the 
average to two pounds for each bushel of wheat, and there is left alto- 
gether ninety-four pounds of shorts, fine-feed, and middlings as the 
refuse of the three hundred pounds of wheat. Stated in terms of 
per cent, this result will read as follows :— 
Flour. east : ; : . 65.84 
Feed . : - 7 : 5 : $1.33 
Loss . ; : : , rs Reais A £5) 
— 100.00 
Liebig, in his Chemische Briefe, 4 Aufl, 1859, 2, 169, says that 
the best mills yield from twelve to twenty per cent of bran (ten parts 
of coarse bran, seven parts of fine bran, and three parts of bran meal), 
and ordinary mills as much as twenty-five per cent. According to 
_ Knapp (as cited by v. Bibra), one hundred pounce of wheat ground 
in an old-fashioned mill yields : — 
Flour: . or ] ; : 55 lbs. 
Middlings  . ‘ : ‘ : - 18 
Fine-feed . ; . ; ‘ : 9 
Bran . ; ‘ ‘ ‘ 4 BaF 
— 100 
While one hundred pounds of wheat ground in a modern mill near 
Paris yields : — 
Flour of various grades  . =. Se ~Ss78 Ibs, 
Middlings’  . pe 2 : Ah Ks 
Fine-feed . ; : . ; A 3 
Bran . - ; ; : : rae oy 
Loss and waste . : ; : : 2 > 
— 100 
Professor Johnston (on p. 498 of his book cited above) makes the 
following statement. Three lots of good English wheat ground at 
Durham gave per cent respectively :— 
Fine flour . By 2 ay 75.1 77.9 
Boxings . \ 9.0 8.3 6.1 
Sharps. jy (8 6.6 5.6 
Bran... .. : 7.8 7.0 6.9 
Waste : inte 8.2 3.0 8.5 
100.00 100.00 100.00 
