A Note on the Differentiation of the Yellow Plant Pigments from the Fat-Soluble Vitamine.

THE identification of the yellow plant pigments-carotene and xanthophyllwith certain lipochromes of the animal body has been established by Palmer and his co-workers and has formed the substance of an interesting series of investigations. Palmer and Eckles [1914, 1] first identified the yellow colouring matter of cow's milk with carotene accompanied by insignificant traces of xanthophyll. They showed that cows fed on a carotene-free diet yielded, after some weeks,