The _conservatory_ has all the plants growing in the soil, instead of being in pots and placed on shelves. It is generally more lofty and architectural than a greenhouse, and of much greater extent; and it is frequently attached to the house, being so contrived that it can be entered from one of the living-rooms. The temperature of the conservatory is generally rather warmer than that of the common greenhouse, as it is kept at 60° during the day, and seldom allowed to fall lower than 40° at night. The _orangery_ is a still more architectural-looking building than the conservatory, and it has an opaque roof. It is used only for preserving orange trees and other plants that remain in a dormant state during the winter, and it requires no more heat than is absolutely essential to keep out the frost. The _camellia house_ is generally formed like a common greenhouse, but so contrived as to allow the whole of the sashes to be taken off during the summer. The plants are kept on stone shelves, raised one above another; and there is generally no walk at the back. Of the culture of the plants in the Australian house I have already spoken; and of those in the greenhouse I need only detail the management during the winter months, as your greenhouse will, I suppose, be in the reserve-ground, and will be only used to preserve those plants during winter which you have kept in other more conspicuous situations during the summer. Many persons injure greenhouse plants by keeping them too warm, and giving them too little air during winter, and then are surprised that their plants become sickly and remain without flowering, notwithstanding all the care and expense that have been bestowed upon them. No greenhouse ought to be kept at a greater heat at night than from 35° to 40°; and in the daytime it should not be allowed to rise above 50°, or at most 52°. When there happens to be sunshine, the fire ought to be lessened, and whenever the air is not frosty the windows ought to be opened from twelve till two every day. If a greenhouse is kept too warm, it will induce premature vegetation, and the plants will waste their strength in an attempt to produce flowers and fruit, at a season when nature requires them to be kept in a state of complete repose. Greenhouse plants should be watered generally every morning; but in frosty weather water need not be given every day, and some plants will not require watering oftener than once a week. This, however, must depend in a great measure on circumstances, and, as a general rule, it may be observed, that water may always be given in small quantities when the surface of the earth contained in the pot looks dry. The pots should never be allowed to stand in saucers, as stagnant water is peculiarly injurious in winter. Whenever the earth looks black and sodden, the plant should be turned out of the pot, and, after the black earth has been carefully shaken from the root, it