a twentieth of the full size, firmly clasped a thin twig. But leaves
grown to a quarter of their full size can likewise act.

Tropaeolum minus (?).--The internodes of a variety named "dwarf
crimson Nasturtium" did not revolve, but moved in a rather irregular
course during the day to the light, and from the light at night. The
petioles, when well rubbed, showed no power of curving; nor could I
see that they ever clasped any neighbouring object. We have seen in
this genus a gradation from species such as T. tricolorum, which have
extremely sensitive petioles, and internodes which rapidly revolve
and spirally twine up a support, to other species such as T. elegans
and T. tuberosum, the petioles of which are much less sensitive, and
the internodes of which have very feeble revolving powers and cannot
spirally twine round a support, to this last species, which has
entirely lost or never acquired these faculties. From the general
character of the genus, the loss of power seems the more probable
alternative.

In the present species, in T. elegans, and probably in others, the
flower-peduncle, as soon as the seed-capsule begins to swell,
spontaneously bends abruptly downwards and becomes somewhat
convoluted. If a stick stands in the way, it is to a certain extent
clasped; but, as far as I have been able to observe, this clasping
movement is independent of the stimulus from contact.

ANTIRRHINEAE.--In this tribe (Lindley) of the Scrophulariaceae, at
least four of the seven included genera have leaf-climbing species.

Maurandia Barclayana.--A thin, slightly bowed shoot made two
revolutions, following the sun, each in 3 hrs. 17 min.; on the