Sckunck . — The Chemistry of Chlorophyll. 121 
EXPLANATION OF FIGURES IN PLATE VII. 
Illustrating Dr. Schunck’s paper on the Chemistry of Chlorophyll. 
Absorption Spectra of Chlorophyll and of some of its Derivatives. 
Fig. 1. Chlorophyll in alcohol. 
Fig. 2. The same very much diluted so as to show the bands at the blue end of 
the spectrum (by sunlight). 
Fig. 3. Chrysophyll (erythrophyll) in ether (by sunlight). 
Fig. 4. Phyllocyanin in ether. 
Fig. 5. Phyllocyanin in concentrated hydrochloric acid. 
Fig. 6. Phylloxanthin in ether. 
Fig. 7. Phyllocyanin cupric acetate in alcohol. 
Fig. 8. Phyllocyanin ferrous palmitate in alcohol. 
Fig. 9. The same after treatment with cold hydrochloric acid. 
Fig. 10. Phyllocyanin zinc carbonate in alcohol. 
Fig. 11. Product obtained by treating phyllocyanin with caustic alkali, then with 
acid, or by treating phyllotaonin with acid, in ether. 
Fig. 12. Ethyl-phyllotaonin, in ether. 
Fig. 13. First product of the action of tin and hydrochloric acid on phyllocyanin, 
in ether. 
Fig. 14. Final product of the action of tin and hydrochloric acid on phyllo- 
cyanin, in ether. 
Note. — The spectra represented on this plate were observed and drawn by my 
son, Charles A. Schunck. — E. S. 
