An Effect of Gibberellic Acid on the Flowering of Xanthium, a Short Day Plant.

vinelanidii. The related compounds tested, phenoxyacetic acid, phenylpropionic acid, orthoand parachlorophenoxyacetic acids, inhibited the test organism to lesser degrees. Protection from the inhibition produced by 2 x 10-2 MI phenoxyacetic acid and phenylpropionic acid was afforded by molar ratios of 1: 1 and 2: 1 respectively', magnesium to the agents. Considerable protection, though not complete protection, from the inhibition produced by 2 x 10-22 ortho-chlorophenoxyacetic acid was provided by a molar ratio of 2: 1, magnesium to the test compound. A 1: 1 molar ratio of magnesium to the agent provided protection from the inhibition produced by para-chlorophenoxyacetic acid at 8 x 1-3 NM.