MICROSCOPICAL. EXAMINATION OF FLOUR. 21 



Table 21. — Limitations and average counts on bran particles and hairs for patent flours. 



Commercial grade. 



Bran particles. 



Variation. Average 



Hairs. 



Variation. 



Hard- wheat patent. . . , 



Soft- wheat patent 



Blended-wheat patent 



13 to 72. 

 19 to 133 

 18 to 83. 



2 to 45. 

 lto34. 

 13 to 40 



STRAIGHT FLOURS. 



When only one grade of flour is manufactured in the mill, this 

 grade is commercially designated as a straight flour, if it contains the 

 entire flour content of the wheat that it is possible to mill. It might 

 be considered to contain all of the flour that could be obtained from 

 the wheat kernel with the exception of a certain percentage of so- 

 called low-grade or red dog flour. Such a straight flour naturally 

 would contain more of the branny particles from the wheat kernel 

 than would a patent flour. The practice of compositing such a flour 

 apparently varies in different mills. Tests were made upon a large 

 number of straight flours milled from hard, soft, and blended wheats. 

 The detailed information on these tests is given in the following para- 

 graphs. 



STRAIGHT FLOURS MILLED FROM HARD WHEATS. 



Seventeen straight flours reported as having been milled from 

 hard wheats were examined for their offal content. The com- 

 mercial grades ranged from 92 to 100 per cent. The results of the 

 examination appear in Table 22. 



Table 22. — Results of examination of straight flours milled from hard wheats. 



Sample No. 



Com- 

 mercial 

 grade. 



Bleached. 



Bran 

 particles. 



Hairs. 



Total. 



15196-K-U 



"Per cent 



straight." 



92 



95 



95 



96 



97 



97§ 



98 



98 



98 



98 



98 



98 



98 



98 



100 



100 



100 



No 



33 

 71 

 50 

 89 

 37 

 57 

 62 

 55 

 58 

 62 

 71 

 63 

 57 

 71 

 76 

 60 

 121 



34 

 55 

 45 

 33 

 25 

 39 

 31 

 51 

 61 

 87 

 65 

 19 

 26 

 47 

 61 

 17 

 22 



67 



11028-K-E 



(?) 



126 



17157-L-B 



Yes 



95 



17155-L-HH 



Yes 



122 



15154-K-C 



Yes 



62 



15106-K 



(?) 



96 



11067-K 



(?)... 



93 



15136-K-BB 



Yes... 



106 



15147-K 



Yes 



119 



15191-K 



(?) 



149 



15194-K-U 



Yes 



136 



17113-L 



Yes 



82 



17152-L-Y 



(?)... 



83 



17177-L-XX 



No... 



118 



11073-K-GG . . 



(?). . 



137 



17146-L-F 



No 



77 



17186- L-F 



No 



143 









The count obtained on bran particles ranged from 33 to 121 and 

 that on hairs from 17 to 87. The average bran particle count was 

 64 and the average hair count 43. The total offal count ranged 

 from 62 to 149/ with an average of 106. 



