188 Contributions to the Chemistry of Chlorophyll. 



all the properties of phyllocyanin. I think therefore that the mother- 

 liquors contained that colouring matter only, along with fatty matters 

 and other impurities. 



EXPLANATION OF PLATE. 



Absorption Spectra of Phyllocyanin and its principal Compounds and Derivatives, 



L Chlorophyll in alcohol. This spectrum is given merely for the sake of com- 

 parison, not as a new representation of what has so frequently been depicted 

 by others. 



2. Phyllocyanin in ether. 



3. Phyllocyanin in concentrated hydrochloric acid. 



4. Phyllocyanin cupric acetate in ether. 



5. Phyllocyanin ferrous palmitate in alcohol. 



6. Phyllocyanin ferrous palmitate after treatment with hydrochloric acid in the 



cold. 



7. Phyllocyanin ferrous palmitate after treatment with boiling hydrochloric acid. 



8. Phyllocyanin ferrous malate in alcohol. 



9. Phyllocyanin ferrous malate after treatment with hydrochloric acid. 



10. Phyllocyanin zinc carbonate in alcohol. This spectrum should be compared 



with that of chlorophyll. 



11. Product obtained by treating phyllocyanin with caustic alkali, then with acetic 



acid, in ether. 



12. Product formed by the further action of acetic acid on the preceding, in ether. 



13. Product of the action of alcoholic potash or soda on phyllocyanin, in ether. 



14. First product of the action of tin and hydrochloric acid on phyllocyanin, in 



ether. 



15. Final product of the action of tin and hydrochloric acid on phyllocyanin, in 



ether. 



