SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 87. NUMBER 13 



THE FUNCTIONS OF RADIATION IN THE 

 PHYSIOLOGY OF PLANTS 



1. GENERAL METHODS AND APPARATUS 



(With One Plate) 



BY 



F. S. BRACKETT AND EARL S. JOHNSTON 



Division of Radiation and Organisms, Smithsonian Institution 



(Publication 3179) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



NOVEMBER 14, 1932 



