SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 97. NUMBER 11 



AN ASSAY METHOD FOR GROWTH-PROMOTING 



SUBSTANCES UTILIZING STRAIGHT GROWTH 



OF THE AVENA COLEOFTILE 



(With One Plate) 



BY 



ROBERT L. WEINTRAUB 



Division of Radiation and Organisms, 



Smithsonian Institution 



(Publication 3488) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



DECEMBER 31, 1938 



