Letter | Published:

Ultra-violet Radiations and Antirachitic Substances

Naturevolume 115page837 (1925) | Download Citation



IN Science (1924, 60, 274) Kugelmass and McQuarrie published a preliminary account of experiments they had carried out which led them to think that substances like cod liver oil which possess antirachitic properties emit ultra-violet light on undergoing a process of auto-oxidation. Their technique was briefly as follows. The cod liver oil was made alkaline with caustic potash, and oxygen was bubbled through; the oxidised oil saturated with oxygen was then placed in a beaker, and over it was placed an air-tight photographic plate-holder made of lead containing a sensitised plate. The plate-holder had let into it two windows, one made of quartz and the other of glass. The face of the plate-holder containing these windows was placed directly over the oxidised oil, which was kept in the dark for twenty-four hours. On development the plate showed an image corresponding to the position of the quartz window. It was concluded that this effect was produced by ultra-violet radiations emitted by the oxidised oil since no image was produced where the glass window had been, and the possibility of direct chemical action was excluded by the plate-holder being air-tight.

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  1. University College, London

    • J. C. DRUMMOND
  2. National Institute for Medical Research, Hampstead

    • T. A. WEBSTER


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