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During the first two days they began rising in the early
afternoon in a nearly straight line, until between 6 and 7 P.M., when they
stood vertically. During the latter part of the night, or more probably in
the early morning, they began to fall or open, so that by 6.45 A.M. they
stood fully expanded and horizontal. They continued to fall slowly for some
time, and during the second day described a single small ellipse, between 9
A.M. and 2 P.M., in addition to the great diurnal movement. The course
pursued during the whole 24 h. was far less complex than in the foregoing
case of Cassia. On the third morning they fell very much, and then
circumnutated on a small scale round the same spot; by 8.20 P.M. they
showed no tendency to rise at night. Nor did the cotyledons of any of the
many other seedlings in the same pot rise; and so it was on the following
night of June 5th. The pot was then taken back into the hot-house, where it
was exposed to the sun, and on the succeeding night all the cotyledons rose
again to a high angle, but did not stand quite vertically.


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