Different nations have adopted various methods of separating the grain from the ear. The most ancient we read of was that of driving cattle over the sheaves in order to trample it out. Large planks, blocks of marble, heavy carriages, have been employed in later times for this end. In most parts of Europe the flail is now in use, but in England begins to be superseded by the powerful and expeditious but complicated threshing machine. The Sumatrans have a mode differing from all these. The bunches of padi in the ear being spread on mats, they rub out the grain between and under their feet; supporting themselves in common for the more easy performance of this labour by holding with their hands a bamboo placed horizontally over their heads. Although, by going always unshod, their feet are extremely callous, and therefore adapted to the exercise, yet the workmen when closely tasked by their masters sometimes continue shuffling till the blood issues from their soles. This is the universal practice throughout the island. After treading out or threshing the next process is to winnow the corn (mengirei), which is done precisely in the same manner as practised by us. Advantage being taken of a windy day, it is poured out from the sieve or fan; the chaff dispersing whilst the heavier grain falls to the ground. This simple mode seems to have been followed in all ages and countries, though now giving place, in countries where the saving of labour is a principal object, to mechanical contrivances. In order to clear the grain from the husk, by which operation the padi acquires the name of rice (bras), and loses one half of its measured quantity, two bamboos of the former yielding only one of the latter, it is first spread out in the sunshine to dry (jumur), and then pounded in large wooden mortars (lesung) with heavy pestles (alu) made of a hard species of wood, until the outer coat is completely separated from it, when it is again fanned. This business falls principally to the lot of the females of the family, two of whom commonly work at the same mortar. In some places (but not frequently) it is facilitated by the use of a lever, to the end of which a short pestle or pounder is fixed; and in others by a machine which is a hollow cylinder or frustum of a cone, formed of heavy wood, placed upon a solid block of the same diameter, the contiguous surfaces of each being previously cut in notches or small grooves, and worked backwards and forwards horizontally by two handles or transverse arms; a spindle fixed in the centre of the lower cylinder serving as an axis to the upper or hollow one. Into this the grain is poured, and it is thus made to perform the office of the hopper at the same time with that of the upper, or movable stone, in our mills. In working it is pressed downwards to increase the friction, which is sufficient to deprive the padi of its outer coating.