18 



C. S. FRENCH, J. H. C. SMITH, H. I. VIRGIN 



600 



650 



7 50 mp 



700 

 WAVELENGTH 



Fig. 2. The fluorescence spectra of chlorophyll c and pheophytin c. 



600 



650 



700 



750 mp 



WAVELENGTH 

 Fig. 3. The fluorescence spectra of protochlorophyll and protopheophytin. 



References 



1. French, C. S., Smith, J. H. C, Virgin, H. I., and Airth, R., "Fluorescence 



spectrum curves of chlorophylls, pheophytins, phycocyanins, and h3^peri- 

 cin," Plant Physiol, SI, 369-374 (1956). 



2. Smith, J. H. C, and Benitez, A., "Chlorophylls: Analysis in plant materials," 



in Modern Methods of Plant Analysis, K. Paech and M. V. Tracey, eds., Vol. 

 4, pp. 142-196, Springer, Berlin, 1955. 



3. French, C. S., "Fluorescence spectrophotometry of photosynthetic pigments," 



in Luminescence of Biological Systems, F. H. Johnson, ed., pp. 51-74, Ameri- 

 can Association for the Advancement of Science, Washington, D.C., 1955. 



