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1. The major pigment in the red coronas of certain cultivated varieties of Narcimu8 was separated from other pigments chromatographically on alumina. 2. The unknown pigment showed a chromatographic behaviour like that of fl-carotene, and it could not be separated from ,B-carotene on alumina or magnesia. The spectral-absorption curve resembled that of fl-carotene. In colour and shape the crystals resembled those of all-tran8s f-carotene. The pigment supported growth in rats deficient in vitamin A, and led to storage in their livers of a substance that gave a blue colour with antimony trichloride reagent. It is concluded that the pigment is fl-carotene. 3. The carotene was found in the coronas in concentrations up to 3 mg./g. based on the fresh weight, or 2 % of the dry weight. In red fringes only from the coronas of N. poeticus8 recu7vU the carotene comprised about 16-5% of the dry weight. 4. Other pigments, probably free and esterified carotenols, were present in amounts approximately equivalent to half the fl-carotene contents. 5. Pigments from trumpets of yellow forms ('daffodil '), although presumably carotenoids, included only small proportions of carotene. 6. Tests with hydrochloric acid suggested that the trumpets of yellow forms contained epoxides but that the coronas and perianths of the red-corona forms did not.

Steroids of pregnant mare's urine. 5. Identification of two androstane-3:16-diols. The structure of ‘uranolone’