have made new roots and got firm hold of the soil. Epiphyllums, when
grown as standards, should be tied to strong wire supports, those with
three short, prong-like legs being most desirable, as, owing to the
weight of the head of the plant, a single stake is not sufficient to
hold the whole firmly. After potting, no water should be given for a few
weeks. In fact, if the atmosphere in which the plants are placed be kept
a little moist, it will not be necessary to water them till signs of
fresh growth are perceived. For Epiphyllums and Rhipsalis, water will be
required earlier than this; but even they are best left for a few days
without water, after they have been repotted. As soon as fresh growth is
perceived, the plants may be well watered, and from this time water may
be supplied as often as the soil approaches dryness. Newly-imported
plants, which on arrival are usually much shrivelled and rootless,
should be potted in rather dry soil and small pots, and treated as
recommended above. Cactuses, we must remember, contain an abundance of
nourishment stored up in their stems, and upon this they will continue
to exist for a considerable time without suffering; and, when their
growing season comes round, root action commences whether the soil is
wet or dry, the latter being the most favourable.

Plants altogether exposed to the air will push roots in due time. A
remarkable instance of this has been recorded by Mr. J. R. Jackson,
curator of the museums at Kew. A plant of Pilocereus senilis, which had
grown too tall for the house, was cut off at the base, and placed in the
museum as a specimen. Here it gradually dried up to within 2 ft. of the
top, where a fracture across the stem had been made. Above this the stem
remained fresh and healthy, and, on examining it some months afterwards,
it was found that not only had the top of the stem remained green, but
it had formed roots of its own, which had grown down the dead lower
portion of the stem, and were in a perfectly healthy state. When it is