This invention combines in the simplest possible manner in one machine, the four well-known functions necessary to cfl'eetually clean wheat of all foreign substances, and render it fit for grinding ; these arc, first, a capability of separating all the lighter and foreign substances by blast; second, separating by screening or sieving those foreign substances whose specific gravity will not allow of their passing off by the action of a proper blast ; third, of depriving the, grain of all smut which may not have been blown off or separated before arriving at the scouring cylinder, and also scouring and polishing the grain; and fourth, depriving the wheat by a light suction, as fast as it passes from the scouring cylinder, of dust, &c, without lifting and interfering with its discharge. It is the invention of I). M. Donehoo, of Hooketown, Pa., and was patented this week