N(. G. 



ui!;faki!vii!:nt of agricul'juke. 



57a 



set stones; complete puiilicalioii Nva« not possible b^ sncL a process. 

 This was followed bv hij;h-nii]ling, in which the grain was coarsely 

 ground betweem stones less closely set, the fine flour bolted out, 

 and the middlings then reduced by repeated grinding between more 

 closely set stones. This latter process is excellently well adapted 

 to soft winter wheat, but not so well to the harder spring varieties. 

 For these, the roller process is best in which hardened steel rolls 

 are employed to crack the brittle grain, the products of the several 

 breaks being successively bolted as the grain goes between rolls 

 more and more closely set. Besides the milling machinery proper, 

 all good mills are to-day equipped witli screening, blowing and brush- 

 ing machines for the removal of foreign seeds, gravel and dust. 



Teller* reports the distribution of materials in several milling 

 operations: A. 7,000 pounds of mixed wheat; mill, 7 breaks, 40 

 bushels per hour capacity; B. Red wheat and C. Fulcaster, 3,000 

 pounds of each on a small 4-break mill of 7 bushels per hour capacity. 



Yield of Parts in Percentages. 



The proportions of "patent'' and "straight'' flours differ much in 

 the several cases, but the entire yields of good quality flour in the 

 three trials are respectively 68.74, G8.00 and G7.80, figures agreeing 

 excellently w'ell. The quantities of epidermis, germ, etc., classed 

 as bran, also exhibit little difference. The names and proportions 

 of the several minor by-products differ very much, however. 



For the composition of the several products, analyses of those of 

 the first two of the above milling tests will suffice: 



• Bulletin 42. Arkansas Experiment Station. 



