[(1) A minute fragment of a fly was placed on one side of the disc, and
after 32 m. seven of the outer tentacles near the fragment were
inflected; after 10 hrs. several more became so, and after 23 hrs. a
still greater number; and now the blade of the leaf on this side was
bent inwards so as to stand up at right angles to the other side.
Neither the blade of the leaf nor a single tentacle on the opposite
side was affected; the line of separation between the two halves
extending from the footstalk to the apex. The leaf remained in this
state for three days, and on the fourth day began to re-expand; not a
single tentacle having been inflected on the opposite side.
(2) I will here give a case not included in the above thirty-five
experiments. A small fly was found adhering by its feet to the left
side of the disc. The tentacles on this side soon closed in and killed
the fly; and owing probably to its struggle whilst alive, the leaf was
so much excited that in about 24 hrs. all the tentacles on the opposite
side became inflected; but as they found no prey, for their glands did
not reach the fly, they re-expanded in the course of 15 hrs.; the
tentacles on the left side remaining clasped for several days.
(3) A bit of meat, rather larger than those commonly used, [page 238]
was placed in a medial line at the basal end of the disc, near the
footstalk; after 2 hrs. 30 m. some neighbouring tentacles were
inflected; after 6 hrs. the tentacles on both sides of the footstalk,
and some way up both sides, were moderately inflected; after 8 hrs. the
tentacles at the further or distal end were more inflected than those
on either side; after 23 hrs. the meat was well clasped by all the
tentacles, excepting by the exterior ones on the two sides.
(4) Another bit of meat was placed at the opposite or distal end of
another leaf, with exactly the same relative results.
(5) A minute bit of meat was placed on one side of the disc; next day
the neighbouring short tentacles were inflected, as well as in a slight
degree three or four on the opposite side near the footstalk. On the
second day these latter tentacles showed signs of re-expanding, so I
added a fresh bit of meat at nearly the same spot, and after two days
some of the short tentacles on the opposite side of the disc were
inflected. As soon as these began to re-expand, I added another bit of
meat, and next day all the tentacles on the opposite side of the disc
were inflected towards the meat; whereas we have seen that those on the
same side were affected by the first bit of meat which was given.]
Public-domain text, read in full here on John Shaqi.
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