SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 87. NUMBER 12 



A SPECTROPHOTOMETRIC DEVELOPMENT FOR 



BIOLOGICAL AND PHOTOCHEMICAL 



INVESTIGATIONS 



(With Three Plates) 



SEP :,,J 1932 



BY 

 F. S. BRAGKETT AND E. D. McALISTER 



■^L^JCE LlBR.Nji- 



Division of Radiation and Organisms, Smithsonian Institution 



(Publication 3176) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



SEPTEMBER 26, 1932 



