vertically, so that in this case there was simply a single great daily fall
and rise. The other seedling behaved rather differently, for it fell in the
morning until 11.30 A.M., and then rose, but after 12.10 P.M. again fell;
and the great evening rise did not begin until 1.22 P.M. On the following
morning this cotyledon had fallen greatly from its vertical position by
8.15 A.M. Two other seedlings (one seven and the other eight days old) had
been previously observed under unfavourable circumstances, for they had
been brought into a room and placed before a north-east window, where the
temperature was between only 56o and 57o F. They had, moreover, to be
protected from lateral light, and perhaps were not sufficiently
illuminated. Under these circumstances the cotyledons moved simply
downwards from 7 A.M. till 2 P.M., after which hour and during a large part
of the night they continued to rise. Between 7 and 8 A.M. on the following
morning they fell again; but on this second and likewise on the third day
the movements became irregular, and between 3 and 10.30 P.M. they
circumnutated to a small extent about the same spot; but they did not rise
at night. Nevertheless, on the following night they rose as usual.

Cytisus fragrans (Leguminosae).--Only a few observations were made on this
plant. The hypocotyl circumnutated to a considerable extent, but in a
simple manner--namely, for two hours in one direction, and then much more
slowly back again in a zigzag course, almost parallel to the first line,
and beyond the starting-point. It moved in the same direction all night,
but next morning began to return. The cotyledons continually
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move both up and down and laterally; but they do not rise up at night in a
conspicuous manner.

Lupinus luteus (Leguminosae).--Seedlings of this plant were observed
because the cotyledons are so thick (about .08 of an inch) that it seemed