SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 87, NUMBER 14 



THE FUNCTIONS OF RADIATION IN THE 

 PHYSIOLOGY OF PLANTS 



II. SOME EFFECTS OF NEAR INFRA-RED RADIATION 



ON PLANTS 



(With Four Plates) 



BY 

 EARL S. JOHNSTON 



Division of Radiation and Organisms, Smithsonian Institution 



(Publication 3180) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



NOVEMBER 15, 1932 



