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Mimosa pudica.--The cotyledons were expanded for the first time on Nov.
2nd, and stood vertical at night. On the 15th the first leaf was formed,
and at night the cotyledons were vertical. On the 28th they behaved in the
same manner. On Dec. 15th, that is after 44 days, the cotyledons were still
considerably raised at night; but those of another seedling, only one day
older, were raised very little.
Mimosa albida.--A seedling was observed during only 12 days, by which time
a leaf had been formed, and the cotyledons were then quite vertical at
night.
Trifolium subterraneum.--A seedling, 8 days old, had its cotyledons
horizontal at 10.30 A.M. and vertical at 9.15 P.M. After an interval of two
months, by which time the first and second true leaves had been developed,
the cotyledons still performed the same movement. They had now increased
greatly in size, and had become oval; and their petioles were actually .8
of an inch in length!
Trifolium strictum.--After 17 days the cotyledons still rose at night, but
were not afterwards observed.
Lotus Jacoboeus.


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