1. Three per cent β-indoleacetic acid lanolin mixture applied to the first internode of etiolated bean seedlings caused the formation of galls at the point of application and the development of roots in the galls, and in many cases dense rows of roots developed the entire length of the hypocotyls. 2. The first internodes, second internodes, petioles, and leaves of treated plants increased less in volume, fresh weight, dry weight, and length than did corresponding parts of control plants. 3. The histological responses shown by treated regions of plants grown in continuous darkness closely resemble those shown by plants of comparable age grown under alternating light and darkness, as reported by other investigators. Histological differences between treated and untreated plants grown in continuous darkness were very great. 4. The application of indoleacetic acid to the first internode of etiolated plants retarded the transport of materials from the cotyledons and also the uptake of water by the plants. 5. Analyses of treated and untreated plants that included the determination of fresh weight, dry weight, volume, starch, sugar, and nitrogen contained in different portions of the plants showed that indoleacetic acid greatly affected the direction of transport of materials from the cotyledons. Materials were conducted from the cotyledons upward only as far as the first internode (the point of treatment) in the case of treated plants. At the end of the experiments, transverse sections through the treated portion of plants grown in the dark showed no apparent evidence of mechanical blockage or inhibition of development of the conductive tissues. 6. No significant differences were observed in the amount of dry matter respired by treated as compared with control plants.