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, and during the whole of this
time it circumnutated in a nearly similar manner, but to a very small
extent. The tracing given (Fig. 93) relates only to the movement during the
first 26 h.
(2) Glaucium luteum (Papaveraceae, Fam. 12).--A young plant, bearing only 8
leaves, had a filament attached to the youngest leaf but one, which was 3
inches in length, including the petiole. The circumnutating movement was
traced during 47 h. On both days the leaf descended from before 7 A.M.
until about 11 A.M., and then ascended slightly during the rest of the day
and the early part of the night. During the latter part of the night it
fell greatly. It did not ascend so much during the second as during the
first day, and it descended considerably lower on the second night than on
the first. This difference was probably due to the illumination from above
having been insufficient during the two days of observation. Its course
during the two days is shown in Fig. 94.
Fig. 94. Glaucium luteum: circumnutation of young leaf, traced from 9.30
A.M. June 14th to 8.30 A.


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