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Magnolia Kobus A.P. DE CANDLLE, a tall deciduous tree, growing in mountainous regions of Central and Northern Japan, is also frequently planted in our gardens. It is highly appreciated on account of the profuse and splendid blooming which occurs in early spring before the development of foliage". The large pure white flower petals of this tree contain a substance, which gives a dark olive green reaction with ferric chloride and a cherry-red coloration upon the reduction with nascent hydrogen, as was just the case with the pigment formerly obtained by us from. Meratia-flower. From these preliminary tests it became clear that the compound might well be regarded as a flavone derivative. The correctness of this view was ascertained by a series of careful investigations, which has finally lead us to a conclusion, that the coloring substance is nothing else than the rutin, i.e. rhamnoglucoside of quercetin. The content of this substance in flower petals is relatively small, amounting to only 0.05 /a of fresh flower material. Details of our experimental results will be given in following lines.

A Coloring Matter Contained in the White Flower of Magnolia Kobus