X PREFACE 



committee representing different departments at the University of Wis- 

 consin engaged in one phase or another of plant growth substance work 

 arranged this symposium. The committee felt that, particularly since 

 many of the persons who are responsible for the early development of 

 the subject are still active and would be available for participation, 

 much could be gained not only from a formal program of lectures 

 covering principles, main lines of investigations, and recent develop- 

 ments, but even more from group discussions and individual contacts 

 between persons engaged in the fundamental and appHed aspects of the 

 field. 



The present volume contains the papers presented In general meetings 

 and round table discussions, September 5-7, 1949. 



The generosity of the Wisconsin Alumni Research Foundation in 

 providing a grant through the University Research Committee of the 

 Graduate School and of the Knapp Fund in providing a grant through 

 the Wisconsin Centennial Committee has made this symposium possible. 



On behalf of the Growth Substances Research Committee grateful 

 acknowledgement is made to the sponsors and to all members of the 

 University Administration and Faculty who helped to plan and conduct 

 the meetings. 



Folke Skoog 

 Madison, Wisconsin, April 6, igso. 



