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e. only 38 per cent.
Melilotus Petitpierreana.--The plants were exposed to a clear sky for 35 -
40 m.: temperature on surrounding grass -3o to -4o C. Six leaves had been
pinned out so as to stand about ? inch above the cork, and four had been
pinned close to it. These 10 leaves were all killed, but the closely pinned
ones suffered most, as 4 of the 6 which stood above the cork still retained
small patches of a green colour. A considerable number, but not nearly all,
of the free leaves, were killed or much injured, whereas all the pinned out
ones were killed.
[page 292]
Melilotus macrorrhiza.--The plants were exposed in the same manner as in
the last case. Six leaves had been pinned out horizontally, and five of
them were killed, that is, 83 percent. We estimated that there were 200
free leaves on the plants, and of these about 50 were killed and 20 badly
injured, so that about 35 per cent of the free leaves were killed or
injured.
Lotus aristata.--Six plants were exposed for nearly 5 h. to a clear sky;
temperature on surrounding grass -1.5o C.


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