Botany and — 279 
_Tound its mens it permanently retains its spiral form even when the 
support is remove 
id inter- 
odes of the Ceropegia at the distance at first of 15 and then of 21 
course, so that after a seurisrovolation it again came into contact with the 
the oR and then, as soon as the western contraction had well bested 
the shoot en = a — gic stick, and its weight, coinciding with 
the northw contrac ould cause it suddenly to fall to the 
Opposite ae with its sae + slightly inclined positions ; sree the iodisieg 
revolving movement would go on. I have described thi it 
first made me understand the nih in _— the fining or turges- 
sees cells 8 revolving shoots mu 
w just aes further iia as I believe, a fact observed by 
von Moh! | (3. 135), namely, that a rcaes ti oot, though it will twine 
round an object as thin as a thread, cannot do so round a thick support. 
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Ses unexplained. Some tendrils and so rae le of leaf: — plants 
- €qually possess this revolving power; but their usefulness de mainly 
: upon additional and more s endowments,—mainly — rt power 
as responding by curvature to the contact, more o: | pro 
an extraneous body. 
