C. S. I'RENCH 469 



illumination, and perhaps somehow for the variation of rate with 

 wavelength at light saturation. 



One reason for the current interest in the long wavelength forms 

 of clilorophyll C„f)95 and C,,707 is the expectation that they might be 

 the final pigments in the energy transfer chain. It is evident from 

 the enhancing effect of 695 ni/x light on photosynthesis from 650 m^x 

 light that such transfer to C,i695 is not taking place. This step is 

 therefore intentionally absent in the diagram. This scheme is pre- 

 sented only as a starting-point for discussion and will no doubt be 

 modified or abandoned as new experiments and better understanding 

 clarify the role of accessory pigments in photosynthesis. 



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