ASSIMILATION OF CARBON 



II 



chloric acid upon an alcoholic chlorophyll solution produces first chlorophyllan, 

 then phylloxanthin, and finally phyllocyanin. The interesting substance phyl- 



Fig. 5. — Absorption spectra of five different concentrations of chlorophyll a. (After Willstatter 



and Stoll.) 



Fig. 6. — Absorption spectra of five different concentrations of chlorophyll b. (After Willstatter 



and Stoll.) 



loporphyrin 1 (C 16 Hi 8 N 2 0, or C32H36N4O2) 2 is obtained by treating phyllocyanin 

 with strong alkalies. Phylloporphyrin crystallizes in beautiful, dark red-violet 



1 Schunck, E. and Marchlewski , L., Zur chemie des Chlorophylls. (Zweite Abhandlung.) Liebig's 

 Ann. Chem. u. Pharm. 284: 81-107. 1895. 



2 Willstatter, Richard, and Fritzsche, Hermann, Ueber den Abbau von Chlorophyll durch Alkalien. 

 Liebig's Ann. Chem. u. Pharm. 371 : 33-124. 1900. 



