Effects of Some Essential Oil Vapors on the Stomata of Eupatorium and Mentha.

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Abstract
On charging the air current circulating through the porometer cup with oil vapors of eucalyptus, lemon, peppermint and citronella, significant closing responses by the stomata of both plants could be detected. Presumably the closing responses, at least as far as relatively high vapor concentrations are concerned, may be due to toxic action of the vapors on leaf cells.

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