SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 92, NUMBER 11 



PHOTOTROPIC SENSITIVITY IN RELA- 

 TION TO WAVE LENGTH 



(With Two Plates) 



BY 

 EARL S. JOHNSTON 



Division of Radiation and Organisms, Smithsonian Institution 



(Publication 3285) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



DECEMBER 6, 1934 



