sixty-six inflected or sub-inflected; after 6 hrs. 40 m. all but
twenty-four inflected or sub-inflected; after 9 hrs. 40 m. all but
seventeen inflected; after 24 hrs. all but four inflected or
sub-inflected, only a few being closely inflected; after 27 hrs. 40 m.
the blade inflected. The leaf remained in this state for two days, and
then began to re-expand.
(10) After 38 m. twenty-one tentacles inflected; after 3 hrs. 12 m.
forty-six tentacles inflected or sub-inflected; after 6 hrs. 40 m. all
but seventeen inflected, though none closely; after 24 hrs. every
tentacle slightly curved inwards; after 27 hrs. 40 m. blade strongly
inflected, and so continued for two days, and then the tentacles and
blade very slowly re-expanded.
(11) This fine dark red and rather old leaf, though not very large,
bore an extraordinary number of tentacles (viz. 252), and behaved in an
anomalous manner. After 6 hrs. 40 m. only the short tentacles round the
outer part of the disc were inflected, forming a ring, as so often
occurs in from 8 to 24 hrs. With leaves both in water and the weaker
solutions. But after 9 hrs. [page 160] 40 m. all the outer tentacles
except twenty-five were inflected; as was the blade in a strongly
marked manner. After 24 hrs. every tentacle except one was closely
inflected, and the blade was completely doubled over. Thus the leaf
remained for two days, when it began to re-expand. I may add that the
three latter leaves (Nos. 9, 10, and 11) were still somewhat inflected
after three days. The tentacles in but few of these eleven leaves
became closelyinflected within so short a time as in the previous
experiments with stronger solutions.
We will now turn to the twenty corresponding leaves in water. Nine had
none of their outer tentacles inflected; nine others had from one to
three inflected; and these re-expanded after 8 hrs. The remaining two
leaves were moderately affected; one having six tentacles inflected in
34 m.; the other twenty-three inflected in 2 hrs. 12 m.; and both thus
remained for 24 hrs. None of these leaves had their blades inflected.
So that the contrast between the twenty leaves in water and the twenty
in the solution was very great, both within the first hour and after
from 8 to 12 hrs. had elapsed.
Of the leaves in the solution, the glands on leaf No. 1, which in 2
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