Cuapr. III. FUMARIACE A. 125 
metamorphosis of the terminal leaflets is complete, 
and they are converted into perfect tendrils. Whilst 
the plant is young, the tendrils appear like modified 
branches, and a distinguished botanist thought that 
they were of this nature; but in a full-grown plant 
there can be no doubt, as J am assured by Dr. Hooker, 
that they are modified leaves. When of full size, they 
are above 5 inches in length; they bifurcate twice, 
thrice, or even four times; their extremities are 
hooked and blunt. All the branches of the tendrils 
are sensitive on all sides, but the basal portion of the 
main stem is only slightly so. The terminal branches 
when lightly rubbed with a twig became curved in 
the course of from 30 m. to 42 m., and straightened 
themselves in between 10 hrs. and 20 hrs. A loop 
of thread weighing one-eighth of a grain plainly 
caused the thinner branches to bend, as did occasion- 
ally a loop weighing one-sixteenth of a grain; but 
this latter weight, though left suspended, was not 
sufficient to cause a permanent flexure. The whole 
leaf with its tendril, as well as the young upper inter- 
nodes, revolves vigorously and quickly, though irregu- 
larly, and thus sweeps a wide space. The figure traced 
on a bell-glass was either an irregular spire or a 
zigzag line. The nearest approach to an ellipse was an 
elongated figure of 8, with one end a little open, and 
this was completed in 1 hr. 53 m. During a period 
of 6 hrs. 17 m. another shoot made a complex figure, 
apparently representing three and a half ellipses. 
When the lower part of the petiole bearing the leaflets 
