For singularity and grotesqueness of form, as well as for the exceptional conditions under which they grow to the best advantage, no class of plants is more remarkable than the CactaceÆ. Of these, about a thousand species have been described by botanists; nearly all are indigenous to the New World, though but a small proportion are in cultivation. Cactuses delight in a dry, barren, sandy soil. They are naturally children of the desert. It is said by travellers that many of the species bear edible fruit, resembling somewhat in taste the gooseberry. So much for the peculiarities of the Cactus family in its native localities, but how can we succeed in cultivating the plants with satisfactory results in the window-garden?

There are two simple methods of treatment that Cactuses should receive, namely: First, keep the soil about them constantly dry, and keep them in a warm place. Secondly, the soil should be of a poor quality, mixed with a little brick dust, and they should never be allowed too much pot room. If either of these two points are observed in the treatment of Cactuses, there will be no difficulty in keeping them in a flourishing condition all the time.

THE NIGHT-BLOOMING CEREUS.

The Night-blooming Cereus is an interesting plant, and excites much admiration when in flower, as it blooms at night-time only, the flowers closing up when exposed to the day-light. They are magnificent flowers when in full blow, but, unhappily, are short-lived, a flower never opening a second time. The plant belongs to the Cactus Family, and requires the same general treatment. There are a number of night-flowering species and varieties, but the one especially known as the Night-blooming Cereus is Cereus grandiflorus, which, when in full bloom, presents a rare sight. Some of the flowers of the night-blooming kinds are exceedingly fragrant, notably Cereus triangularis, a single flower of which, when in fall bloom, will fill the air of a room with its pleasant odor. These plants can be made to bloom freely by keeping the soil quite dry, and allowing them very little pot-room, as they depend more upon the atmosphere than the soil for their growth. We have known large plants of Cereus grandiflorus, to produce as many as twenty-five fine blossoms each in the course of a season. We have found that liquid manure, if applied to these plants about once a month, and when the soil about them is very dry, will work wonders in their growth, and when a rapid growth can be obtained, there will be no trouble in having an abundance of flowers at regular intervals. Care must be taken not to have the liquid too strong. A small quantity of brick dust, mixed with the soil in which they are growing, will be beneficial. These species of Cereus are easily propagated by cuttings, which will root readily in sand of any kind. Being of a slender habit of growth, and rather rampant, they should have some sort of support, and it is advisable to either train them to a trellis, or upon wires, or a string stretched over and along the window sash. We have had a number of flowers of a pure feathery white, C. grandiflorus, that were over fifteen inches in diameter; this is the best of the night-flowering species.

PROPAGATING REX BEGONIAS.

Those Begonias, known as belonging to the Rex division, are very beautiful, and also very distinct in both leaf and flower from all other species and varieties. The leaves are noted for their peculiar shape and markings, making them very valuable as ornamental house plants. They are easily multiplied from the leaf with its stalk. To propagate these, the leaf, or leaves, including the stalk, should be taken off close to the plant. Insert the stem of the leaf in sand, and deep enough to allow the leaf to lie flat upon the surface of the sand. It will take them about from two to three weeks to root, after which they should be potted in good, rich soil. It will take sometime to start them into a growth, but they grow very rapidly when they begin, and in two years will make large plants.