lO 



PHYSIOLOGY OF NUTRITION 



centration and finally merge into one another, so that only the red rays, between 

 A and 5, and a part of the green can pass through a concentrated solution or a 

 thick layer; finally, with still further increase in concentration or thickness 



Fig. 5. — AbsorptLon spectra of five different concentrations of chloroph\il (7. {Aflcr Willstatter 



and Stall.} 



Fig. 6. — Absorption spectrum of five different concentrations of eltloropliyU />. (Afler 



WilhlalU-r anil Sloll.) 



of la\'er, the green rays arc also completcl\- absorbed and only the rays between 

 A and B are transmitted. All objects appear reti when seen through a verv 

 concentrated solution or a ver_\- thick la\-er. 



The aljsorption sjiectra of chloroplndl a and chlorophyll b, in acetone, are 



