.bio. 21. Spectra of certain plant pigments 



Absorption spectra of chlorophyll and associated pigments. Scale of wave lengths at 

 top and bottom. Fraunhofer lines marked at the top. The colours of the regions of the 

 spectrum indicated at the bottom. 



1. Nettle leaf living. Chlorophyll in colloidal state (Willstatter and Stoll, p. 62). 



2. a Chlorophyll in ether (do., p. 170). 3. /3- Chlorophyll in ether (do., p. 171). 

 4. Carotin in alcohol (do., p. 246). 5. Xanthophyll in alcohol (do. p. 246). 



From " Principles of General Physiology.'" W. M. Bayliss (Longmans). 



