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Melilotus suaveolens.--Some plants with 8 leaves pinned out were exposed to
a clear sky during 2 h., the temperature on the surrounding grass being -2o
C. Next morning 6 out of these 8 leaves were in a flaccid condition. There
were about 150 free leaves on the plant, and none of these were injured,
except 2 or 3 very young ones. But after two days, the plants having been
brought back into the greenhouse, the 6 pinned-out leaves all recovered.
Melilotus Taurica.--Several plants were exposed for 5 h. during two nights
to a clear sky and slight frost, accompanied by some wind; and 5 leaves
which had been pinned out suffered more than those both above and below on
the same branches which had gone to sleep. Another pot, which had likewise
been kept in the greenhouse, was exposed for 35 - 40 m. to a clear sky, the
temperature of the surrounding grass being between -3o and -4o C. Nine
leaves had been pinned out, and all of these were killed. On the same
plants there were 210 free leaves, which had been allowed to go to sleep,
and of these about 80 were killed, i.


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