SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 95. NUMBER 9 



PRELIMINARY OBSERVATIONS ON GROWTH 



AND PHOTOTROPIC RESPONSE OF 



OAT SEEDLINGS 



BY 



ENOCH KARRER 



Division of Radiation and Organisms 



Smithsonian Institution 



i 



(Publication 3389) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



JUNE 2, 1936 



