Cuap. IL. CLEMATIS. 49 
clasped the stick, was that of a man standing by a 
column, who throws his arm horizontally round it. 
With respect to the stem’s power of twining, some 
remarks will be made under C. calycina. 
Clematis Sieboldi—A shoot made three revolutions 
against the sun at an average rate of 3hrs. 11m. The 
power of twining is like that of the last species. Its 
leaves are nearly similar in structure and in function, 
excepting that the sub-petioles of the Jateral and 
terminal leaflets are sensitive. A loop of thread, 
weighing one-eighth of a grain, acted on the main 
petiole, but not until two or three days had elapsed. 
The leaves have the remarkable habit of spon- 
taneously revolving, generally in vertical ellipses, in 
the same manner, but in a less degree, as will be 
described under C. microphylla. 
Clematis calycina.—The young shoots are thin and 
flexible: one revolved, describing a broad oval, in 
5 hrs. 30 m., and anotherin 6hrs. 12m. They followed 
the course of the sun; but the course, if observed long 
enough, would probably be found to vary in this species, 
as well as in all the others of the genus. It is a rather 
better twiner than the two last species: the stem some- 
times made two spiral turns round a thin stick, if free 
from twigs; it then ran straight up for a space, and 
reversing its course took one or two turns in an 
opposite direction. This reversal of the spire occurred 
in all the foregoing species. The leaves are so small 
compared with those of most of the other species, that 
the petioles at first seem ill-adapted for clasping. 
