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Year Degree Awarded
Formaldehyde, Plant regulators
The action of formaldehyde as a stimulant to plant growth revives the so-called law or hypothesis of Arndt (1)** that substances toxic to the living plant may, in very dilute concentrations, act as a stimulant. In general, between the toxic and stimulative concentrations there is the gradation of the former into the latter. This gradation may properly be called "toleration". (See plate 1.)