MICROSCOPICAL EXAMINATION OF FLOUR, 
Table 8. — Effect of method of computing average on count. 
11 
Method of averaging. 
Bran particles. 
Keenan. 
Min. Max 
Lyons. 
Min. Max 
Hairs. 
Keenan. 
Min. Max 
Lyons. 
Min. Max. 
By twos.. 
By threes 
By fours . 
By fives. . 
EXAMINATION OF MILL STOCKS. 1 
Before undertaking a discussion of the work done on finished com- 
mercial flours, it seemed advisable to consider the degree of purity of 
the various mill stocks entering into the composition of the end- 
product. The data compiled in Table 9 demonstrate the quality of 
the stocks made on the break rolls, the purpose of which is to crush 
the wheat kernel to release the enclosed endosperm that is later re- 
duced to fineness on other rolls and finally purified of offal debris. 
The general practice in milling is to make as little break flour as possi- 
ble. When break flour is made to any extent, it invariably con- 
tains a notable amount of offal, consisting of bran particles, as well 
as numerous hairs from the beard. The results recorded in Table 9 
were obtained on samples of material procured from the first, second, 
third, and fourth break rolls, respectively, and from different mills. 
It was stated that they had been bolted through silks of various 
numbers of meshes per lineal inch, the following silks being employed: 
Silk number. 
Meshes 
per inch. 
lOxx 
109 
116 
125 
125 
125 
129 
139 
llxx 
12xx 
12x 
12xxx 
13xx 
1 The designations for the various stocks and grades of flour examined, as well as the statements concern- 
ing the kind of wheat from which the flour was milled, were taken from the millers supplying the samples 
and were not verified in the Bureau of Chemistry. 
