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"The Power of Movement in Plants"


(12.) After one day slight deflection, which on the second day amounted to
35o, on the fourth day to 50o, and the sixth day to 63o from the
perpendicular and the cauterised side.
(13.) Whole tip blackened, but more on one side than the other; on the
fourth day slightly, and on the sixth day greatly deflected from the more
blackened side; the deflection on the ninth day amounted to 90o from the
perpendicular.
(14.) Whole tip blackened in the same manner as in the last case: on the
second day decided deflection from the more blackened side, which increased
on the seventh day to nearly 90o; on the following day the radicle appeared
unhealthy.
(15.) Here we had the anomalous case of a radicle bending
[page 174]
slightly towards the cauterised side on the first day, and continuing to do
so for the next three days, when the deflection amounted to about 90o from
the perpendicular. The cause appeared to lie in the tendril-like
sensitiveness of the upper part of the radicle, against which the point of
a large triangular flap of the seed-coats pressed with considerable force;
and this irritation apparently conquered that from the cauterised apex.


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