SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 87, NUMBER 12 



A SPECTROPHOTOMETRIC DEVELOPMENT FOR 



BIOLOGICAL AND PHOTOCHEMICAL 



INVESTIGATIONS 



(With Three Plates) 



BY 



F. S. BRAGKETT AND E. D. McALISTER 



Division of Radiation and Organisms, Smithsonian Institution 



(Publication' 3176) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



SEPTEMBER 26, 1932 



