Preface 



Dr. G. S. Avery, Prof. J. Bonner, Prof. T. A. Bennet-Clark, Prof. H. Burstrom, 

 Dr. P. Larsen, and Prof. L.J. Audus. Their assistance in diis connection was 

 greatly appreciated. It is also a pleasure to record the help provided by all 

 members of the Chemistry Department and Agricultural Research Council 

 Growth Substance Unit at Wye in preparing for this meeting. Finally, 

 warmest thanks are due to Dr. Frank Wightman, the Organizing Secretary, 

 for all his efforts to ensure the smooth running of the Conference. 



R. L. Wain 



Wye College, University of London 

 16 September 1955 



VI 



