Abstract
NATURE of April 1, 1920, p. 139, published an interesting article on the colouring matters of plants. From this article it would appear that the normal pale yellow colour of the primrose is due to a yellow sap pigment, a derivative of flavone. Primroses, however, are found with a range in colour from deep red to almost white. Can any of your readers say to what this variation from the normal is due, and whether the colours are anthocyans?
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