98 TENDRIL-BEARERS. Cuap. IIL. 
described large regular ellipses. I could detect no 
spontaneous movement in the petioles of the leaves. - 
Whilst the tendrils are revolving more or less 
regularly, another remarkable movement takes place, 
namely, a slow inclination from the light towards 
the darkest side of the house. I repeatedly changed 
the position of my plants, and some little time after 
the revolving movement had ceased, the successively _ 
formed tendrils always ended by pointing to the 
darkest side. When I placed a thick post near a 
tendril, between it and the light, the tendril pointed 
in that direction. In two instances a pair of leaves 
stood so that one of the two tendrils was directed 
towards the light and the other to the darkest side of 
the house; the latter did not move, but the opposite 
one bent itself first upwards and then. right over its 
fellow, so that the two became parallel, one above the 
other, both pointing to the dark: I then turned the 
plant half round; and the tendril which had turned 
over recovered its original position, and the opposite 
one which had not before moved, now turned over to 
the dark side. Lastly, on another plant, three pairs 
of tendrils were produced at the same time by three 
_ shoots, and all happened to be differently directed: I 
placed the pot in a box open only on one side, and 
obliquely facing the light; in two days all six ten- 
drils pointed with unerring truth to the darkest corner 
of the box, though to do this each had to bend in a 
different manner. Six wind-vanes could not have 
more truly shown the direction of the wind, than did 
