SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 94 NUMBER S 



WAVE LENGTHS OF RADIATION IN THE VISIBLE 



SPECTRUM INHIBITING THE GERMINATION 



OF LIGHT-SENSITIVE LETTUCE SEED 



BY 



LEWIS H. FLINT 



Division of Seed Investigations, Bureau of Plant Industry, 



U. S. Department of Agriculture 



AND 



E. D. McALISTER 



Division of Radiation and Organisms, 



Smithsonian Institution 



(PUBLI.CATION 3334) 



CITY OF WASHINGTON 

 PUBLISHED BY THE SMITHSONIAN INSTITUTION 



JUNE 24, 1935 



