ee of the Royal Horticultural Society, February
16th, 1868, in a hyacinth with perfectly green, long, tubular, erect,
not horizontally spreading flowers.

[563] An illustration of this latter nature in the case of a cherry,
which was surmounted by the calyx lobes, precisely as in the case of a
pomaceous fruit, has been given at p. 424, _adnot._

APPENDIX

DOUBLE FLOWERS.[564]

In ordinary language, the epithet double flowers is applied to flowers
of very varied structural conformation. The most common conditions
rendering a flower double, in the popular acceptation of the term, are
substitutions of petals or petal-like bodies for stamens and pistils,
one or both. (See Petalody, p. 283.) Another very common mode of
doubling is brought about by a real or apparent augmentation in the
number of petals, as by multiplication, fission, or chorisis. (See pp.
66, 343, 371, 376.) Sometimes even the receptacle of the flower within
the outer corolla, divides, each subdivision becoming the centre of a
new series of petals, as in some very luxuriant camellias and anemones.
The isolation of organs which, under ordinary circumstances, are united
together, is another circumstance, giving rise, in popular parlance, to
the use of the term double flower. (See Adesmy, Solution, pp. 58, 76,
82.) Prolification is another very frequent occurrence in the case of
these flowers, while still other forms arise from laciniation of the
petals, or from the formation of excrescences from the petals or
stamens, in the form of supplementary petal-like lobes. (See Enation, p.
443.)

As these matters are all treated of under their respective headings, it
is not necessary to allude to them again in detail. It may be well,
however, to allude, in general terms, to the causes which have been
assigned by various writers for their formation, and to the means which
have been adopted by practical experimenters to secure the production of
the flowers often so much esteemed by the florist. It must be admitted
that, in spite of all that has been written on the subject, but very
little is known about these matters. In the case of the stock the
following means have been adopted by cultivators in order to obtain
plants bearing double instead of single flowers. There is first the
crossing of single flowers with double ones, effected by planting a
double-flowered plant in proximity to a single-flowered one; but this,
it is obvious, could lead to no important