“ Customs mills are defined in this report as mills grinding wheat, corn, and other grain furnished from farms in the neighborhood, and are usually denominated grist-mills. Merchant mills are large manufacturing establishments supplying the home market, and exporting flour to the principal foreign countries. ”

“ In the gravity purifiers, which are used for the larger-sized grains, the middlings pass in a thin stream through a current of air produced by a revolving fan, and so regulated that the bran is blown away while the wheat, being heavier, drops down into a receptacle. ”

“ The chemical composition of the various cereals used as food and of the products evolved by milling, and of the final products formed therefrom by baking and other methods of preparation, are given in part ix., Bulletin 13, “Cereals and Cereal Products,” of the Bureau of Chemistry of the United States Department of Agriculture. ”

“ The largest number of small mills was found in Pennsylvania, and of mills of the greatest capacity in Minnesota, The total number of flour and grist-mills grinding wheat was 13,188, of which 1655 belong to the class producing less than 100 barrels per annum. The growth of the milling industry in general during the last half-century is shown by the following statistics: In 1850 there were 11,891 establishments in the United States engaged in milling cereal products ”

“ The millstones are at a, the lower of which is firmly fixed, and the upper is made to revolve, on a shaft which passes up through the lower one, at a speed of one hundred revolutions per minute, more or less. ”