Licenses. Special license regulations 25, feeding stuffs, effective Aug. 1, 1918, contains all special regulations issued up to July 15, 1918, which affect importers, manufacturers, mixers, and dealers in feeds or feed ingredients, excepting millers of wheat, rye, corn, oats and barley, cottonseed crushers, sugar refiners, and other licensees who manufacture feed as by-product of licensed food commodities for whom special sets of rules have been issued.