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The changes in geo‐ and photolropism exhibited by plants trealed with morphactin, the methyl‐2‐chloro‐9‐hydroxyfluorene‐(9)‐carboxylic acid, have been explained as inhibition of the basipetal and promotion of the acropetal and lateral transport of indol‐3yl‐acetic acid and the equalization of its levels in horizontally placed plant tissues. The geotropical unresponsiveness of morphactin treated corn coleopliles appeared to be related to the distribution and immobility of starch grains acting as geosensors. The author is indebted to Dr. J. E. Fisher for advice and Mr. W. Richards for his technical assistance.

Treatment of tobacco with gibberellic acid in field and greenhouse experiments had little effect on yield of leaves but decreased the nicotine content of both leaves and roots. It is postulated that the decrease of nicotine content in the tobacco leaves resulted from a change in the metabolism of roots caused by gibberellic acid applications.

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