MICROSCOPICAL EXAMINATION OF FLOUR. 19 
PATENT FLOURS MILLED FROM MIDDLINGS STOCKS ONLY. 
Information was obtained concerning the history of the mill 
streams entering into the composition of a large number of so-called 
patent flours. The data collected showed that middlings stocks onty 
were employed in composing these flours. The results of the counts 
made on these samples are recorded in Table 19. 
Table 19. — Results of examination of patent flours milled from middlings stocks only. 
Sample No. 
Commer- 
cial 
grade. 
Bleached. 
Bran 
particles. 
Hairs. 
Total. 
17151-L-MM 
"Per cent 
patent. " 
40 
60 
70 
71 
71 
72 
72 
74 
74 
80 
Short 
patent. 
(?) 
(?) 
19 
15 
22 
20 
19 
27 
17 
29 
13 
17 
28 
16 
13 
5 
21 
10 
13 
14 
4 
26 
2 
19 
23 
8 
32 
15152- K-A 
Yes 
20 
11070- K-FF : 
(?) 
43 
17154-L-AA 
No 
30 
17158- L-X 
Yes 
32 
15186- K-X 
No 
41 
15174-K-LL 
(?) 
21 
15170- K-CC : . 
No 
55 
17144-L-FF 
No ..." 
15 
15181-K-S 
Yes 
36 
15146- K-W.... 
(?) 
51 
15163-K-R 
Yes 
24 
Table 19 shows that the bran particle count ranged from 13 to 29, 
with an average of 20, that the hair count ranged from 2 to 26, with 
an average of 13, and that the total offal count ranged from 15 to 55, 
with an average of 33. These results demonstrate the fact that the 
purified middlings stocks employed had some effect upon the purity of 
the end-product. From the information the writers were able to 
obtain, however, so-called patent flours were not always composed of 
the best streams in the mill. 
PATENT FLOURS MILLED FROM MIDDLINGS STOCKS PLUS LOWER-GRADE STOCKS IN THE 
MILL. 
As already stated, stocks other than first-class middlings were often 
passed into patent flours. According to the information submitted, 
break flours and lower grades of middlings frequently were found to 
have been employed in the manufacture of the finished flour. The 
results recorded in Table 20 illustrate the effect of the addition of 
mill streams appreciably high in offal to the finished product. 
