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Medical Officers of the Army of

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TABLE II.—Showing Results of section of Distal Pinnules on Mornings
after a fall of Rain
.

No. of
Experi-
ment.
Result.
  These experiments were carried out on two successive mornings, those of the 20th
and 28th March, a fall of rain having occurred on each of the previous even-
ings. The brake of the plant was not exposed to direct sunshine at the time
of experiment, and the leaves were clean washed but nearly dry, there having
been hardly any dew during the preceding nights. All the leaves were young
ones
.
1 Action in the cut pinnules; pause; action in the primary pulvinus; spreading action
in the cut pinna; action in the base of the other distal pinna; long pause;
partial and slow action throughout two other pinnæ, and slight action in the
base of the third one; no further result; very rapid recovery.
2 Spreading action in the cut pinna; action in the primary pulvinus, and extreme
depression; slow and, partial action in the bases of two of the other pinnæ;
no further result; very rapid recovery.
3 Very slow, spreading action in that pinna save in the basal pair of pinnules; no
further result.
4 Very slow, partial action in the pinnules of the cut pinna save three basal ones;
no further result.
5 Action in cut pinnules; pause; action in primary pulvinus; slow, almost com-
plete, centripetal action in the cut pinna; no further result.
6 Slow, centripetal action in the cut pinna; action in the primary pulvinus, and
extreme depression; slow, partial action throughout one other pinna; and very
slow, very partial action in the basal two-thirds of another; no further result.
7 Action in the cut pinnules; and in one or two pairs beneath them; pause; action
in the primary pulvinus; long pause; spreading centripetal action in the cut
pinna; pause; slight action in the base of the other distal pinna; no further
result; primary pulvinus readily responsive to mechanical impulse.
8 Tip of one pinnule only cut .—Action in that pair; pause; action in primary pul-
vinus, and full depression; long pause; very slow, partial action in the base
of the other pinna (a two pinnaed leaf); no further result.
9 Action in the cut pinnules; pause; action in the primary pulvinus; very slow
action in the pinnules of the cut pinna; slow, partial action in the other pinna
(a two pinnaed leaf) commencing ere action had extended to the base of the
cut one.
10 Slow, almost complete action in that pinna; pause; action in the primary pul-
vinus, and extreme depression; slow, partial action in two other pinnæ; no
further result.

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