Take acorns, fully ripe, deprive them of their covers and beat them into a paste, let them lay in water for a night, and then press the water from them, which deprives the acorns entirely of their astringency. Then dry and powder the mass for use. When wanted, knead it up into a dough with water, and roll it out into thin cakes, which may be baked over embers. Bread made after this method is by no means disagreeable, and even to this day, it is said to be made use of in some countries. Sea Biscuit. The process of biscuit-baking for the British navy is as follows, and it is equally simple and ingenious. The meal, and every other article, being supplied with much certainty and simplicity, large lumps of dough, consisting merely of flour and water, are mixed up together; and as the quantity is so immense as to preclude, by any common process, a possibility of kneading it, a man manages, or, as it is termed, rides a machine, which is called a horse. This machine is a long roller, apparently about four or five inches in diameter, and about seven or eight feet in length. It has a play to a certain extension, by means of a staple in the wall, to which is inserted a kind of eye, making its action like the machine by which they cut chaff for horses. The lump of dough being placed exactly in the centre of a raised platform, the man sits upon the end of the machine, and literally rides up and down throughout its whole circular direction, till the dough is equally indented; and this is repeated till it is sufficiently kneaded; at which times, by the different positions of the lines, large or small circles are described, according as they are near to or distant from the wall.