SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 87. NUMBER 13 



THE FUNCTIONS OF RADIATION IN THE 

 PHYSIOLOGY OF PLANTS 



I. GENERAL METHODS AND APPARATUS 



(With One Plate) ^f^sS^*'^* ''^"^^/^//^ 





BY 



NOV if 1932 



F. S. BRAGKETT AND EARL S. JOHNSTON 



Division of Radiation and Organisms, Smithsonian Institutijjq, „ 



N 



(Publication 3179) 



CITY OF WASHINGTON 

 PUBLISHED BY THE SMITHSONIAN INSTITUTION 



NOVEMBER 14, 1932 



