286 M. K. Bach and J. Fellig 



ACKNOWLEDGMENTS 



The authors wish to thank Mr. Waker J. Skraba and Mr. Donald 

 A. Salisbury for the preparation of the radioactive 2,4-D, and Dr. 

 Donald G. Crosby and Mr. Robert V. Berthold for the Avena inter- 

 node assays. The devoted and competent assistance of Miss Mary 

 Jane Persohn is gratefully acknowledged. 



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