Studies on the Growth Hormone of Plants

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Abstract
By applying an agar block containing growth substance (G S) to a succession of test plants and measuring the resulting curvatures it has been found that a constant fraction of the G S in the block passes into the plant. Upon the assumption that the amount of G S entering the plant is proportional to its concentration in the agar, a calculation of the reaction rate constant for the process shows that it is independent both of the concentration of G S and of the size of the block. The data of Went which were originally believed to indicate a different behavior of the G S are shown to agree, within the limits of experimental error, with the mechanism here described.

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