Whatever may be the aspect of the house, a greenhouse may be projected from it, unless it be due north; and even in that case there are many exceptions. We shall take the same extent of ground that has already come under consideration, and shall suppose a green-house projected from the living-room, as shown at c, in fig 49.; in which a is the entrance-hall, and b the principal living-room. Underneath the green-home there is a vault, in which is placed the furnace; and from a boiler over it hot water pipes are conducted up into the green-house, where they are concealed behind the shelves, or stage, on which the pots stand. In the vault, various articles which require little or no light may be forced, as already mentioned. The communication between the green-home (e) and the living-room (b) is by a glass door, the view through which, from the room, is along the front of the stage, and,- consequently, brings into perspective all the finest plants. Plans of green-houses will be given hereafter.