348 



RADIATION BIOLOGY 



JR 



A = \- (B + T) 



A 



R-T 



WHITE SURFACE 



BAROlER 

 LAYER CELL 



GLASS 



in 



GLASS OVER ALGA 



A 



GLASS OVER BLACK PAPER 



a 



Fig. 6-1. The measurement of ahsorption, reflection, and transmission of a leaf or algal 

 suspension by the integrating sphere. (I) Procedure of Rabideau e^ a/. ( 1946). (II) 

 Procedure of Seybold and Weissweiler (1942a) using the Hardy recording spectro- 

 photometer. (Ill) Haxo and Blinks (1950) half -sphere method. 



correcting absorption data in scattering media for errors of path length 

 which are not taken care of by integrating-sphere measurements. It is, 

 however, difficult to see just how such corrections can be used with the 

 data available. 



ABSORPTION AND REFLECTION SPECTRA OF LEAVES AND ALGAE 



The study of absorption spectra of leaves and algae has been of interest 

 for various reasons: (1) to determine how light absorption by various 



