97. Camellia Japonica: circumnutation of leaf, traced from 6.40 A.M.
June 14th to 6.50 A.M. 15th. Apex of leaf 12 inches from the vertical
glass, so figure considerably magnified. Temp. 16o - 16 1/2o C.
In the chapter on the Sleep of Plants we shall see that the leaves in
several Malvaceous genera sink
Fig. 98. Pelargonium zonale: circumnutation and downward movement of young
leaf, traced from 9.30 A.M. June 14th to 6.30 P.M. 16th. Apex of leaf 9 1.4
inches from the vertical glass, so figure moderately magnified. Temp. 15o -
16 1/2o C.
at night; and as they often do not then occupy a vertical position,
especially if they have not been well illuminated during
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the day, it is doubtful whether some of these cases ought not to have been
included in the present chapter.
(7.) Pelargonium zonale (Geraniaceae, Fam. 47).--A young leaf, 1 1/4 inch
in breadth, with its petiole 1 inch long, borne on a young plant, was
observed in the usual manner during 61 h.; and its course is shown in the
preceding figure (Fig. 98). During the first day and night the leaf moved
downwards, but circumnutated between 10 A.
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