1. The pronounced morphological response in plants to 2,4- dichlorophenoxyacetic acid is useful in studies of translocation. 2. The regulator passed upward but not downward through dead segments of stems. 3. Stomata did not appear to be important portals for entry of the compound into the leaves when it was used in aqueous sprays. Leaves of young soybeans absorbed maximum amounts of the growth regulator within 6 hours after application. 4. The movement of food materials was regulated by partial clipping of leaves, defoliation, and reduced light intensity. When the growth regulator was applied to aerial portions of plants, the substance readily moved downward whenever translocation of synthesized materials occurred. 5. More extensive growth inhibition of young red kidney bean plants at primary leaf stage resulted when the substance was added to the base of the blade than when added near the tip. When the compound was added to a primary leaf of a young bean plant more extensive growth inhibition resulted wh...