1. For a review of the literature up to 1924 see Special Report Series No. 38, Medical Research. Council, second edition, 1924.
2. While this note was in the printers' hands, a communication appeared by Steenbock and Daniels (J. Amer. Med. Assoc., 1925, lxxxiv, 1093) in which they mention, without giving details, that irradiated sterols possess anti-rachitic properties.
3. ANTIRACHITIC PROPERTIES IMPARTED TO INERT FLUIDS AND TO GREEN VEGETABLES BY ULTRA-VIOLET IRRADIATION
4. THE ANTIRACHITIC VALUE OF IRRADIATED PHYTOSTEROL AND CHOLESTEROL. I