o that
the reader sees and remembers, he may _call_ anything he
likes. But it is necessary that names should be assigned
to certain classes of leaves which are essentially different
from each other in character and tissue, not merely
in form. Of these the two main divisions have been
already given: but I will now add the less important
ones which yet require distinct names.
#/

I. APOLLINE.--Typically represented by the laurel 51

II. ARETHUSAN.--Represented by the alisma 52

/#
It ought to have been noticed that the character of serration,
within reserved limits, is essential to an Apolline
leaf, and absolutely refused by an Arethusan one.
#/

III. DRYAD.--Of the ordinary leaf tissue, neither
manifestly strong, nor admirably tender, but
serviceably consistent, which we find generally
to be the substance of the leaves of forest trees.
Typically represented by those of the oak.

IV. ABIETINE.--Shaft or sword-shape, as the leaves
of firs and pines.

V. CRESSIC.--Delicate and light, with smooth tissue,
as the leaves of cresses, and clover.
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VI. SALVIAN.--Soft and woolly, like miniature
blankets, easily folded, as the leaves of sage.

VII. CAULINE.--Softly succulent, with thick central
ribs, as of the cabbage.

VIII. ALOEINE.--Inflexibly succulent, as of the
aloe or houseleek.

/#
No rigid application of these terms must ever be attempted;
but they direct the attention to important general
conditions, and will often be found to save time and
trouble in description.
#/

IV. THE FLOWER.

Its general nature and function 65

Consists essentially of Corolla and Treasury 78

Has in perfect form the following parts:--

I. THE TORUS.--Not yet enough described in the
text. It is the expansion of the extremity of
the flower-stalk, in preparation for the support
of the expanding flower 66, 224

II. THE INVOLUCRUM.--Any kind of wrapping or
propping condition of leafage at the base of a
flower may properly come under this head; but
the manner of prop or protection differs in different
kinds, and I will not at present give generic
names to these peculiar forms.

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III. THE CALYX (The Hiding-place).--The outer
whorl of leaves, under the protection of which
the real flower is brought to ma