ABSTRACT
An hygrometer and an evaporimeter, capable of investigating atmospheric conditions over small areas close to the surface of a leaf, are described.
In the case of rapidly transpiring leaves in a slow air stream a humidity gradient has been detected up to a height of 1.2 cm.
1
Thia height is “critical” only in relation to the accuracy of measurements. In theory, the evaporimeter reading approaches a true measure only as the height approaches infinity.
Copyright © 1938 The Company of Biologists Ltd.
1938
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