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On the next day it
circumnutated in a greater degree, describing four irregular ellipses, and
by 3 P.M. had risen into a horizontal position. By 7.15 P.M. it was asleep
and vertically dependent, but continued to circumnutate as long as
observed, until 11 P.M.
Fig. 152. Erythrina crista-galli: circumnutation and nyctitropic movement
of terminal leaflet, 3 3/4 inches in length, traced during 25 h.; apex of
leaf 3 ? inches from the vertical glass. Figure reduced to one-half of
original scale. Plant illuminated from above; temp. 17 1/2o - 18 1/2o C.
Erythrina corallodendron.--The movements of a terminal leaflet were traced.
During the second day it oscillated four times up and four times down
between 8 A.M. and 4 P.M., after which hour the great nocturnal fall
commenced. On the third day the movement was equally great in amplitude,
but was remarkably simple, for the leaflet rose in an almost perfectly
straight line from 6.50 A.M. to 3 P.M., and then sank down in an equally
straight line until vertically dependent and asleep.
[page 368]
Apios tuberosa (Tribe 8).


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