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As the leaf continued to move all the time to the
left, it is evident that the zigzag line represents many circumnutations.
(6.) Camellia Japonica (Camelliaceae, Fam. 32).--A youngish leaf, which
together with its petiole was 2 3/4 inches in length and which arose from a
side branch on a tall bush, had a filament attached to its apex. This leaf
sloped downwards at an angle of 40o beneath the horizon. As it was thick
and rigid, and its
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petiole very short, much movement could not be expected. Nevertheless, the
apex changed its course completely seven times in the course of 11 ? h.,
but moved to only a very small distance. On the next day the movement of
the apex was traced during 26 h. 20 m. (as shown in Fig. 97), and was
nearly of the same nature, but rather less complex. The movement seems to
be periodical, for on both days the leaf circumnutated in the forenoon,
fell in the afternoon (on the first day until between 3 and 4 P.M., and on
the second day until 6 P.M.), and then rose, falling again during the night
or early morning.
Fig.


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