xiv Table of Contents 



S. Housley The Influence of Gibberellic Acid on Indole- 

 B. J. Deverall 3-acetic Acid Disappearance From Solutions 

 Containing Pea Stem Tissues and Indole-3- 

 acetic Acid Oxidase 627 



P. W. Brian Interaction of Gibberellic Acid and Auxin 

 H. G. Hemming in Extension Growth of Pea Stems 645 



/. van Overbeek Inhibition of Gibberellin Action by Auxin . . 657 

 L. Dowding 



OTHER PLANT GROWTH REGULATORS 



G. Beauchesne Separation des Substances de Croissance d'Ex- 



trait de Mai's Immature 667 



Louis G. Nickell Growth Substances and Plant Tissue Cultures 675 

 Walter R. Tulecke 



J. P. Nitsch Growth Factors in the Tomato Fruit 687 



C. Nitsch 



Ulrich Naf On the Physiology of Antheridium Formation 



in Ferns 709 



S. Tonzig- Ascorbic Acid As a Growth Hormone 725 



E. Marre 



A. M. Mayer Coumarins and Their Role in Growth and 

 A. Poljakoff-Mayber Germination 735 



W. C. Hall Studies With C"-labeled Ethylene 751 



C. S. Miller 

 F. A. Herrero 



N. E. Tolbert (2-Chloroethyl)trimethylammonium Chloride 

 and Related Compounds As Plant Growth 

 Substances 779 



IMPROVEMENT OF GROWTH REGULATOR 

 FORMULATION 



A. S. Crafts Improvement of Growth Regulator Formu- 

 lation 789 



Donald P. Gowing Some Comments on Growth Regulators With 



a Potential in Agriculture 803 



Leonard L. Jansen Physical-Chemical Factors of Surfactants in 



Relation to Their Effects on the Biological 

 Activity of Chemicals 813 



THE NEXT STEPS 



James Bonner The Probable Future of Auxinology 819 



SUPPLEMENTARY INFORMATION 



Participants in the Conference 831 



Index 837 



