If these are required, we should continue them, as indicated in fig. 49., from the end of the green-house towards the reserve ground, as shown at d and e; and, if this were done, the same fire which heated the green-house, might, as already mentioned, heat the forcing-bouses also. This is easily done by having a separate set of pipes for the greenhouse, the circulation of the water in which can be stopped whenever heat is not wanted there. The fire-place being in a vault beneath the green-house, there would be no danger of its ever communicating more heat through the green-house floor than what would be salutary for the plants. Indeed, by forcing culinary productions or growing mushrooms in the vault, and having the green-house over it, scarcely a particle of heat generated by the fuel would be lost. The forcing-houses, in a suburban garden of this kind, cannot, in general, be made higher than the party-wall of the garden; because this would be to produce a greater shade on the adjoining garden than would be submitted to by its occupier; whose permission would be necessary even to raise the green-house, so that its floor might be on a level with that of the sitting-room.

179. A matt suburban garden, like that shown in fig.49., with the wall having a south aspect covered with glass, with two small forcing-houses, and a reserve garden with pits and frames at the end, would require a first-rate gardener, or a zealous and skilful amateur, to manage it to the greatest advantage; and, in our opinion, unless it is done, it is better to dispense with glass in a garden altogether.