In a word,
transpiration and evaporation is the same thing.
Herr Reinke has made an interesting examination of the action of light
on a plant. He has permitted a pencil of sun rays to pass through a
converging lens upon a cell containing a fragment of an aquatic plant.
He was enabled to increase the intensity of the light, so that it should
be stronger or weaker than the direct sunlight. He could thus vary its
intensity from 1/16 of that of direct sunlight to an intensity 64 times
stronger. The temperature was maintained constant.
Herr Reinke has shown that the chlorophyl action increases regularly
with the light for intensities under that of direct sunlight; but what
is unexpected, that for the higher intensities above that of ordinary
daylight the disengagement of oxygen remains constant.
M. Leclerc du Sablon has published some of his results in his work on
the opening of fruits. The influences which act upon fruit are external
and internal. The external cause of dehiscence is drying.
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