the art of pulverizing, or reducing a dry body into a fine powder; which is performed in friable bodies by pounding or beating them in a mortar, &c.; but to pulverize malleable ones, other methods must be taken. To pulverize lead, or tin, the method is this: Rub a round wooden box all over the inside with chalk; pour a little of the melted metal nimbly into the box; when shutting the lid, and shaking the box briskly, the metal will be reduced to powder.