in England; whilst in Germany they are as popular among the poorer
classes as the Fuchsia, the Pelargonium, and the Musk are with us. One
of the commonest of Cactuses in the latter country is the Rat's-tail
Cactus (Cereus flagelliformis), and it is no unusual thing to see a
large window of a cottager's dwelling thickly draped on the inside with
the long, tail-like growths and handsome rose-coloured flowers of this
plant. This is only one among dozens of species, all equally useful for
window gardening, and all as interesting and beautiful as those above
described.

In Greenhouses.--For the greenhouse proper, Cactuses are well adapted,
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