apted,
either as the sole occupants or as suitable for such positions as are
afforded by shelves or baskets placed near the roof glass. If the
greenhouse is not fitted with heating arrangements, then, by selecting
only those species of Cactus that are known to thrive in a position
where, during winter, they are kept safe out of the reach of frost (of
which a large number are known) a good collection of these plants may be
grown. In heated structures the selection of kinds may be made according
to the space available, and to the conditions under which they will be
expected to grow. Fig. 3 represents a section of a house for Cactuses,
which will afford a good idea of the kind of structure best suited for
them. The aspect is due south.

[Illustration: FIG. 3. SECTION OF HOUSE FOR CACTUSES--A,A, Hot-water
Pipes; B,B, Ventilators.]

When grown on their own roots, the Epiphyllums, as well as the
pendent-growing kinds of Rhipsalis, and several species of Cereus, may
be placed in baskets and suspended from the roof. The baskets should be
lined with thin slices of fibrous peat, and the whole of the middle
filled with the compost recommended for these plants under "Soil". When
well managed, some very pretty objects are formed by the Epiphyllums
grown as basket plants. The climbing Cactuses are usually planted in a
little mound composed of loam and brick rubble, and their stems either
trained along rafters or allowed to run up the back wall of a
greenhouse, against which they root freely, and are generally capable of
taking care of themselves with very little attention from the gardener.

In Frames.--For cultivation in frames, the conditions are the same as
for greenhouses. Even when grown in the latter, it will be found
conducive to the health and flowering of the plants if, during the
summer months, they can be placed in a frame with a south aspect,
removing them back to the house again on the decline of summer weather.
Wherever the place selected for Cactuses may be, whether in a large
plant-house, or a frame, or a window, it is of vital importance to the
plants that the position should be exposed to bright sunshine during
most of the day. Without sunlight, they can no more thrive than a
Pelargonium could without water. In Germany, many growers of almost all
the kinds of Cactuses place their young plants in frames, which are
prepared as follows: In April or May a hot-bed of manure and leaves is
prepared, and a frame placed u