Xll TABLE OF CONTENTS 



Respiratory Changes in Relation to Toxicity hi 



Frederick G. Smith, loiva State College 



TISSUE RESPONSES TO GROWTH SUBSTANCES 



Electrical Polarity and Auxins 123 



A. R. Schrank, University of Texas 



Translocation of Growth-Regulating Substances and Their 

 Effect on Tissue Composition 141 



John W. Mitchell, United States Department of Agriculture 



Experiment Station, Beltsville, Maryland 



Histological Responses to Growth-Regulating Substances 155 



J. M. Beal, University of Chicago 



Comparative Effects of Growth Substances on Stem Anatomy 167 



B. Esther Struckmeyer, University of Wisconsin 



Formative Effects of Hormone-Like Growth Regulators 175 



P. W. Zimmerman, Boyce Thompson Institute for Plant Re- 

 search 



PRACTICAL APPLICATIONS OF 

 GROWTH REGULATORS 



Vegetation Control on Non agricultural Land 187 



K. C. Barrons, Dow Chemical Company 



Differential Responses in Crop Plants 195 



R. S. Dunham, University of Minnesota 



Growth Substances in Relation to the Production of Tree 

 Fruits 207 



Frank E. Gardner, United States Department of Agrictdture 



Experiment Station, Orlando, Florida 



Use of Growth Substances in Tropical Agriculture 225 



J. van Overbeek, Agricultural Laboratory, Shell Oil Company, 

 Modesto, California 



GROWTH SUBSTANCES IN 

 VEGETATIVE DEVELOPMENT 



The Role of Growth Substances in Vegetative Development 

 as Exemplified in Tissue Cultures 247 



Philip R. White, Institute for Cancer Research, Philadelphia 



