J^ 7/ 



GROWTH HORMONES 

 IN PLANTS 



AUTHORIZED ENGLISH TRANSLATION OF 



DIE WUCHSSTOFFTHEORIE 



UND IHRE BEDEUTUNG FUR DIE ANALYSE DBS WACH8TUMS 

 TJND DER WACHSTUMSBEWEQUNGEN DER PFLANZEN 



BY 



P. BOYSEN-JENSEN 



Professor of Plant Physiology, University of Copenhagen 



Translated and Revised by 

 GEORGE S. AVERY, Jr., and PAUL R. BURKHOLDER 



with the Collaboration of 

 HARRIET B. CREIGHTON and BEATRICE A. SCHEER 



Department of Botany. Connecticut College 



Expanded to include 188 new contributions to the 

 literature and 40 additional illustrations 



First Edition 



McGRAW-HILL BOOK COMPANY, Inc. 



NEW YORK AND LONDON 

 1936 



