--The cotyledons, which are
of unequal size, stand horizontally during the middle of the day, and at
night rise up vertically and come into close contact with one another. But
this movement with M. longiflora lasted for only the three first nights.
Beta vulgaris (Polygoneae).--A large number of seedlings were observed on
three occasions. During the day the cotyledons sometimes stood
sub-horizontally, but more commonly at an angle of about 50o above the
horizon, and for the first two or three nights they rose up vertically so
as to be completely closed. During the succeeding one or two nights they
rose only a little, and afterwards hardly at all.
Amaranthus caudatus (Amaranthaceae).--At noon the cotyledons of many
seedlings, which had just germinated, stood at about 45o above the horizon,
and at 10.15 P.M. some were nearly and the others quite closed. On the
following morning they were again well expanded or open.
Cannabis sativa (Cannabineae).--We are very doubtful whether this plant
ought to be here included. The cotyledons of a large number of seedlings,
after being well illuminated during the day, were curved downwards at
night, so that the tips of some pointed directly to the ground, but the
basal part did not appear to be at all depressed.
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