TABLE OF CONTENTS xi 



CHAPTER PAGE 



XI. ROOT FORMATION 183 



A. Root Formation as a Correlation Phenomenon . . . 183 



B. Hormones and Root Formation 185 



C. Nature of the Root-Forming Substance 190 



D. Effect of Light on Root Formation 192 



E. Effects of Factors Other than Auxin 194 



F. Root Formation on Other Organs 202 



G. Practical Applications 204 



XII. BUD INHIBITION 207 



A. Bud Inhibition as a Correlation Phenomenon .... 207 



B. Bud Inhibition Caused by Auxin 209 



C. Possible Mechanisms of Bud Inhibition 213 



XIII. OTHER ACTIVITIES OF AUXINS 217 



A. Auxin and Cell Division 217 



B. Cambial Growth 218 



C. Callus and Stem Swellings 222 



D. Miscellaneous Effects 227 



XW. GENERAL CONCLUSIONS 230 



A. Quantitative Relations between Auxin and Growth . 231 



B. Comparison with Animal Hormones 232 



C. Comparison with Growth Substances of Lower Plants . 235 



D. Regeneration 238 



E. Organization 242 



F. The Stimulus Concept and the Nature of Auxin Action . 244 



G. Abnormal Growth 247 



H. Outlook 248 



BIBLIOGRAPHY 251 



AUTHOR INDEX 285 



SUBJECT INDEX 289 



