NAILS. Nails are required in quantity for training fruit-trees and various other plants on garden walls, and are made of cast iron specially for the purpose. Any of another description would bend rather than enter a hard substance, such as that of a brick, while the cast-iron ones may invariably be driven in a horizontal direction far enough to retain a hold. They are said to be much preserved from rust by heating almost to redness before using, and throwing them into linseed oil. Wall Nails are made in different lengths, and as they are usually sold by weight, the smaller sizes represent a much greater number in any given weight than the larger ones. Nail bags are very handy for holding a stock of shreds, &c., whilst nailing up trees or plants from a ladder. They are best made from leather in the shape of an open pocket, and held in position by a narrow belt and a shoulder strap. One or more upright sheaths or divisions are frequently made inside, in which the workman's knife and hammer may be placed when either are not in use. Canvas bags answer the purpose equally well when leather ones are not procurable.