Further Experiments on Flowering in Xanthium

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Abstract
The application of 2,4-dichloranisole or of 2,3,5-triiodobenzoic acid to cuttings of Xanthium maintained in continuous light of low intensity (8 hrs. in greenhouse, 16 hrs. under intensity of 1 foot-candle) was found to result in induction of changes in the shape of the growing point which resemble the changes brought about by photoperiodic induction. These chemically induced changes, like those induced by short photoperiod, were inhibited by simultaneous application of napthaleneacetic acid.