in rich compost; but when sufficient care and time are
expended in proving, there will exist little danger of subsequent
disappointment." Mr. Salter informs me that with all the varieties the
commonest kind of bud-variation is the production of yellow flowers,
and, as this is the primordial colour, these cases may be attributed to
reversion. Mr. Salter has given me a list of seven differently coloured
chrysanthemums, which have all produced branches with yellow flowers;
but three of them have also sported into other colours. With any change
of colour in the flower, the foliage generally changes in a
corresponding manner in lightness or darkness.

Another Compositous plant, namely, _Centauria cyanus_, when cultivated
in a garden, not unfrequently produces on the same root flowers of four
different colours, viz., blue, white, dark-purple, and
particoloured.[845] The flowers of Anthemis also vary on the same
plant.[846]

_Roses._--Many varieties of the rose are known or are believed to have
originated by bud-variation.[847] The common double moss-rose was
imported into England from Italy about the year 1735.[848] Its origin
is unknown, but from analogy it probably arose from the Provence rose
(_R. centifolia_) by bud-variation; for branches of the common
moss-rose have several times been known to produce Provence roses,
wholly or partially destitute of moss: I have seen one such instance,
and several others have been recorded.[849] {380} Mr. Rivers also
informs me that he raised two or three roses of the Provence class from
seed of the old single moss-rose;[850] and this latter kind was
produced in 1807 by bud-variation from the common moss-rose. The white
moss-rose was also produced in 1788 by an offset from the common red
moss-rose: it was at first pale blush-coloured, but became white by
continued budding. On cutting down the shoots which had produced this
white moss-rose, two weak shoots were thrown up, and buds from these
yielded the beautiful striped moss-rose. The common moss-rose has
yielded by bud-variation, besides the old single red moss-rose, the old
scarlet semi-double moss-rose, and the sage-leaf moss-rose, which "has
a delicate shell-like form, and is of a beautiful blush colour; it is
now (1852) nearly extinct."[851] A white moss-rose has been seen to
bear a flower half