and the filament was attached to the smaller cotyledon on the side furthest
from the window. Moreover the plant was now for the first time placed in
this position. The cotyledons bowed themselves greatly towards the light
from 8 to 10.50 A.M., when the first dot was made (Fig. 7). During the

Fig. 7. Brassica oleracea: conjoint circumnutation of the hypocotyl and
cotyledons, from 10.50 A.M. to 8 A.M. on the following morning. Tracing
made on a vertical glass.

next 12 hours the bead swept obliquely up and down 8 times and described 4
figures representing ellipses; so that it travelled at nearly the same rate
as in the previous case. during the night it moved upwards, owing to the
sleep-movement of the cotyledons, and continued to move in the same
direction till 9 A.M. on the following morning; but this latter movement
would not have occurred with seedlings under their natural conditions fully
exposed to the light.

By 9.25 A.M. on this second day the same cotyledon had
[page 18]
begun to fall, and a dot was made on a fresh glass. The movement was traced
until 5.30 P.M. as shown in (Fig. 8), which is given, because the course
followed was much more irregular than on the two previous occasions. During
these 8 hours the bead changed its course greatly 10 times. The upward
movement of the cotyledon during the afternoon and early part of the night
is here plainly shown.

Fig. 8. Brassica oleracea: conjoint circumnutation of the hypocotyl and
cotyledons during 8 hours. Figure here reduced to one-third of the original
scale, as traced on a vertical glass.