SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 98. NUMBER 19 



THE DETERMINATION OF SMALL 

 AMOUNTS OF CHLOROPHYLL- 

 APPARATUS AND METHOD 



(With Two Plates) 



BY 



EARL S. JOHNSTON 



AND 



ROBERT L. WEINTRAUB 



Division of Radiation and Organisms 



Smithsonian Institution 



Publication 3 545 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



JULY 31, 1939 



