Anthocyanins and anthoeyanidins. Part IV.—Observations on: (a) Anthocyan colours in flowers, and (b) the formation of anthocyans in plants

In a recent paper, Shibata, Shibata and Kasiwagi, dealing with the question of the colours observed in flowers, and the condition of the anthocyan pigments as they exist in plants, arrived at conclusions that differ considerably from those of Willstätter and of Everest. In view of this, and of the fact that Shibata, Shibata and Kasiwagi’s paper has passed into reviews, the present authors feel that the publication of some observations that they have made, both before the publication of the paper referred to, and since receiving it, as confirmation of the present author’s results and extension of the field, will not be out of place. Results of experiments upon the formation of anthocyan pigments are also described, and important conclusions drawn form them.