some stouter kind, than if allowed to grow on their own roots. By
growing a Pereskia on into a large plant, and then cutting it into any
shape desired, we may, by grafting upon its spurs or branches a number
of pieces of Epiphyllum, obtain large flowering specimens of various
shapes in a comparatively short time. For general purposes, it is usual
to graft Epiphyllums on to stems, about 1 ft. high, of Pereskia aculeata;
pretty little standard plants being in this way formed in about a year
from the time of grafting, As an instance of how easily some kinds may
be grafted, we may note what was done with a large head of the
Rat's-tail Cactus which had been grown for some years on the stem of
Cereus rostratus, but which last year rotted off just below the point of
union. On re-grafting this head on to the Cereus a little lower down, it
failed to unite, and, attributing the failure to possible ill-health in
the stock, we determined to transfer the Rat's-tail Cactus to a large
stem of Pereskia aculeata, the result being a quick union and rapid,
healthy growth since. Upon the same stock some grafts of Epiphyllum had
previously been worked, so that it is probable these two aliens will
form on their nurse-stem, the Pereskia, an attractive combination. In
Fig. 6 we have a fine example of this kind of grafting. It represents a
stem of Pereskia Bleo upon which the Rat's-tail Cactus and an Epiphyllum
have been grafted.

[Illustration: FIG. 6. PERESKIA BLEO, WITH EPIPHYLLUM AND CEREUS
FLAGELLIFORMIS GRAFTED UPON IT.]

For most plants the operation of grafting must be carefully and
skilfully performed, but in the case of Cactuses very little skill is
necessary if one or two rules, which apply to all kinds of grafting, are
observed. The period of vigorous growth, and while the sap of both the
stock and the scion is in motion, is the most favourable time for the