116 TEN DRIL-BEARERS. Cuap. III. 
branched, with their tips slightly curved. Whilst 
young they are sensitive on all sides, but chiefly on 
the concaye side of the extremity. They have no 
spontaneous revolving power, but are at first inclined 
upwards at an angle of about 45°, then move into a 
horizontal position, and ultimately bend downwards. 
The young internodes, on the other hand, revolve in | 
ellipses, and carry with them the tendrils. Two 
ellipses were completed, each in nearly 5 hrs.; their 
longer axes were directed at about an angle of 45° 
to the axis of the previously made ellipse. 
Lathyrus grandiflorus—The plants observed were 
young and not growing vigorously, yet sufficiently so, 
I think, for my observations to be trusted. If so, we 
have the rare case of neither internodes nor tendrils 
revolving. The tendrils of vigorous plants are above 
4 inches in length, and are often twice divided into 
three branches; the tips are curved and are sensitive 
on their concave sides; the lower part of the central 
stem is hardly at all sensitive. Hence this plant 
appears to climb simply by its tendrils being brought, 
through the growth of the stem, or more efficiently 
by the wind, into contact with surrounding objects, 
which they then clasp. I may add that the tendrils, 
or the internodes, or both, of Vieva sativa revolve. 
ComposiTa£. — Mutisia clematis. — The immense 
family of the Composite is well known to include 
very few climbing plants. We have seen in the Table 
in the first chapter that Mikania scandens is a re- 
gular twiner, and F. Miller informs me that in S. 
