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When pots were thus reversed, after the evening fall had
already commenced, the sinking movement appeared to be somewhat disturbed;
but all their movements were occasionally variable without any apparent
cause. This latter fact, as well as that of the young cotyledons not
sinking nearly so much as the older ones, deserves notice.
[page 303]
Although the movement of the cotyledons endured for a long time, no
pulvinus was exteriorly visible; but their growth continued for a long
time. The cotyledons appear to be only slightly heliotropic, though the
hypocotyl is strongly so.
Gossypium arboreum (?) (var. Nankin cotton) (Malvaceae).--The cotyledons
behave in nearly the same manner as those of the Anoda. On June 15th the
cotyledons of two seedlings were .65 inch in length (measured along the
midrib) and stood horizontally at noon; at 10 P.M. they occupied the same
position and had not fallen at all. On June 23rd, the cotyledons of one of
these seedlings were 1.1 inch in length, and by 10 P.M. they had fallen
from a horizontal position to 62o beneath the horizon.


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