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The preceding memoir on the chemistry of chlorophyll contained the results arrived at in the analysis of phyllotaonin and its derivatives. In the present communication it is proposed to give further details regarding the properties and composition of alka-chlorophyll, the mother substance of phyllotaonin, on which will follow an account of some products of decomposition of the latter. Some experiments will then be described showing the connection between phylloxanthin and phyllocyanin, and proving that the former may by a simple process be converted into the latter.

II. Contributions to the chemistry of chlorophyll. No. VI