Abstract
The work of Willstätter, of Willstätter and Mallison, and of Willstätter and Zechmeister, that has followed upon the proposal by the present author of a structural formula for the anthoeyan pigments, has clearly demonstrated the correctness of the formula proposed, and of the conclusions of the present author as to the relationship that exists between the anthocyan and flavonol groups, exemplified thus :— Although it has thus been proved that anthocyanidins can be produced from flavonols, and that the flavonol glucosides pass, likewise, to anthocyanins, it does not of necessity follow that the anthocyan pigments are thus formed in plants and flowers, although this is probable, and in the present paper chemical evidence is produced which strengthens this probability.
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