As it is of the greatest importance to the health of the plants to have the soil in a conservatory well drained, many persons form the beds by excavating pits of the proper size, about two feet and a half deep, and put at the bottom a layer of brick-bats, stones, and other materials for drainage, about six inches thick. On this is deposited a thin layer of coarse rough gravel; and on the gravel a layer of rich mould, which should be about two feet thick in the centre of the bed, where the largest shrubs are to be planted, and shelving off to about sixteen or eighteen inches at the sides next the walks. All the sashes should be made to open, and there ought to be large glass doors in front, which should generally stand open during the day in summer, in order to admit as much air as possible. In some places a movable frame is contrived for a conservatory, into which sashes fit in winter, and which, in severe weather, is covered with tarpauling, made to pull down, like a blind, from a roller along the ridge of the roof; the whole frame being so contrived as to be entirely removed in summer. The upright posts of this frame are let into holes in the ground, like the posts in a drying-ground, so that when the posts are taken out, the holes may be stopped up with wooden plugs with rings attached; and the roof and horizontal pieces fit into each other, and into the uprights, the whole being kept firm by bolts. When a conservatory of this kind is to be removed for the summer, the side sashes and doors are taken away first, generally about the middle or end of April. A week or ten days after, the sashes of the roof are taken off, but the frame and tarpauling are left in case of spring frosts; and, when all danger from these is over, the whole of the framework is removed, and the orange trees, camellias, and other exotic trees that have been planted in the conservatory, appear to be growing in the open air. The _orangery_ is often contrived so as to be used as a kind of living-room during summer, as it is only intended for the reception of the orange trees, and other plants belonging to the genus Citrus, during winter. The trees are generally grown in large tubs and boxes, in a rich loamy soil, and are set out in the open air during summer, when they require but little care, provided they are frequently watered over the leaves, though they do not like much water to their roots. When young plants are raised from seed, they seldom flower till they have been budded or grafted from an old tree. Orange trees are generally put in the open air in May, and kept there till September or October; and they are very seldom shifted. They require scarcely any light or water during winter, and no heat beyond what is necessary to protect them from the frost.