ns of a leaflet.

In the normal leaf of this plant there is between the bases of the
pinnae, a small reddish gland or stipel? attached to, or projecting from,
the upper surface of the rachis. It appeared from some transitional
forms that the adventitious leaflet, just mentioned, was due to the
exaggerated development of this gland, but no clue was afforded as to
the origin of the ascidium. It was not practicable to examine the
arrangement of the vascular bundles in the rachis.

_Additional labella in Phaius._--A flower of _Phaius grandiflorus_ was
found in the same condition as the _Catasetum_, mentioned at pp. 291 and
382.

_Tubular stem._--A species of _Sempervivum_, exhibited by Mr. Salter, of
Hammersmith, at one of the summer exhibitions of flowers at the Royal
Horticultural Society in 1868, under the name of _S. Bollei_, deserves
notice from its bearing on the question of such structures as the
calyx-tubes, the hip of the rose and such like, see pp. 394, 482. In
this plant the leaves appeared to be arranged some on the outside,
others on the inside, of an erect hollow cylinder, some six inches in
height. The oldest leaves were outside, the youngest within, so that the
appearance presented was as if the summit of the axis had been pushed or
drawn in, much as the finger of a tight glove might be invaginated in
withdrawing it from the hand.

The plant in question thus furnishes an actual illustration of the
supposititious case mentioned at p. 482.

_Double flowers_, see pp. 499, et seq.--The following species may be
added to those already recorded: _Lychnis coronaria_, _Hibiscus
mutabilis_, _Lotus major_, _Pisum sativum_, _Godetia_ sp., _Ipomoea
purpurea_, _Convolvulus minor_, _Heliotropium peruvianum_, _Trillium
grandiflorum_, and _Phaius grandiflorus_.

INDEX TO SUBJECTS.

A.

Abortion, 455, 467
of axile organs, 455
calyx, 460
corolla, 460
indusium, 467
leaves, 458
ovules, 466
perianth, 460
pistil, 464
receptacle, 457
stamens, 463

Acaulescence, 393

Acaulosia, 393, 456

Acheilary, 398

Adesiny, 58, 76

Adhesion, 32
of axes, 50, 55
embryos, 56
leaves, 33
parts of flower, 34
roots, 53

Adventitious buds, 156, 176
flowers, 174, 176, 180
gemmae, 173
leaves, 162
roots, 156
shoots, 161

Albinism, 337

Alternation, 3, 485

Androecium, enlargement of, 430
meiophylly of, 398
meiotaxy of, 405
of orchids,