NONPLASTID PIGMENTS 



685 



by the nonplastid components was negligible; but this assumption is not, 

 or is not always, justified, particularly in work with blue-violet light. It is 

 therefore advisable to ascertain, before undertaking quantitative work on 

 photosynthesis, whether the plants chosen are free from, or at least poor 

 in, nonplastid pigments. 



iS 



o 



u 



_l 



(xl 



g 



tn 



< 



Q. 



a: 

 o 



en 



OQ 



< 



400 



30 

 20 

 10 



WAVE LENGTH, m^ 

 500 600 



700 



C 30 



20 

 10 

 lOOF 

 90 

 80 

 70 

 60 

 50 

 40 



400 



500 600 



WAVE LENGTH, m/i 



700 



Fig. 22. 10. Spectra of normal (curves 1), aurea (curves 2) and "pur- 

 purea (curves 3) leaves of Corylus avellana (after Seybold and Weiss- 

 weiler 1942). (a) Transmission curves, (6) reflection curves, (c) ab- 

 sorption curves. New absorption curves of yellow, red and white air- 

 filled and air-free leaves can be found in the paper by Seybold and 

 Weissweiler (1943i). 



Noddack and Eichhoff (1939) attempted to determine the absorption of light by 

 the "colorless" components of Chlorella, and concluded that it is negligible. This con- 

 clusion may be correct, but the method employed — comparison with the absorption Ijy 



