66 LEAF-CLIMBERS. Cuar. IL. 
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 curv- 
ing; 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 in- 
ternodes 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 down- 
wards 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. 
ANTIRRHINEZ.—In this tribe (Lindley) of the 
Scrophulariacee, at least four of the seven included 
genera have leaf-climbing species. 
Maurandia Barelayana.—A thin, slightly bowed 
shoot made two revolutions, following the sun, each in 
3 hrs. 17 min.; on the previous day this same shoot 
revolved in an opposite direction. The shoots do not 
twine spiraliy, but climb excellently by the aid of 
