Cuar, ID. CLEMATIS. 53 
C. montana and C. calycina. I ascertained that the 
simple leaves of C. glandulosa exhibited no BPORN 
neous revolving movement. 
Clematis viticella, var. venosa—In this and the two 
following species the power of spirally twining is 
completely lost, and this seems due to the lessened 
flexibility of the internodes and to the interference 
caused by the large size of the leaves. But the re- 
volving movement, though restricted, is not lost. In 
our present species a young internode, placed in front 
of a window, made three narrow ellipses, transversely 
to the direction of the light, at an average rate of 
2hrs. 40m. When placed so that the movements were 
to and from the light, the rate was greatly accelerated 
in one half of the course, and retarded in the other, as 
with twining plants. The ellipses were small; the 
longer diameter, described by the apex of a shoot 
bearing a pair of not expanded leaves, was only 43 
inches, and that by the apex of the penultimate inter- 
node only 1} inch. At the most favourable period of 
growth each leaf would hardly be carried to and fro 
by the movement of the internodes more than two. or 
three inches, but, as above stated, it is probable that 
the leaves themselves move spontaneously. The move- 
ment of the whole shoot by the wind and by its rapid 
growth, would probably be almost equally efficient as 
these spontaneous movements, in bringing the petioles 
into contact with surrounding objects. 
‘The leaves are of large size. Each bears three pairs 
of lateral leaflets and a terminal one, all supported on 
