THE recent discovery that X-rays and y rays can be defracted into spectra by the natural grating contained in the orderly structure of crystals, sets at rest the question as to the nature of these radiations. They are of the same nature as light-waves, but of very much higher frequency—from 10,000 to 100,000 times as high.
Based on a paper read to the members of the Dublin Clinical Club on March 16, by Prof. J. Joly, F.R.S. Reprinted with abbreviations and some revision from the Scientific Proceedings of the Royal Dublin Society, vol. xiv., No. xxxvii.
“Le Radiumé" vii., 1910, p. 247.
Gaskell, Proc. Roy. Soc., Ser. B, vol. lxxxiii., February, 1911, p. 305.
Stevenson, Brit. Med. Jour., July 4, 1914, and March 20, 1915.
Moseley, and Robinson, Phil. Mag., vol. xcviii., September, 1954.
Morson, "Archives of the Middlesex Hospital," xxxiii., p. 110.
Lazarus-Barlow, loc. cit., p. 34.
Joly, Proc. Roy. Soc., Ser. B, vol. lxxxviii., 1914.
J. J. Thomson, Phil. Mag., vol. xxxvi., 1893, p. 320.
Joly, NATURE, vol. lxxii., July 27, 1905, p. 308.
Meldola, "Chemistry of Photography" (Macmillan, 1891), p. 190.
Moore, Roaf, and Whitley, Proc. Roy. Soc., Ser. B, vol. lxxvii., October 1905.
Moore, Roaf, and Whitley, Proc. Roy. Soc., Ser. B, vol. lxxvii., May, 1905.
Copeman, and Hake, Proc. Roy, Soc., Ser. B, vol. lxxx., June, 1908.
Statistics of cases treated in the Middlesex Hospital in s9r show that the number of ceses of the kind in the male and female sexes stand as 8.3: 1 Archives, xxviii., p. 2.
Referred to by Moore, Roaf, and Whitley, Proc. Roy. Soc., Ser. B, vol. xxvii., October, 1905.
See "Encyclopdia Britannica," last ed., Art. Cancer. Statistcs for cancer in England and Wales (1912) show the highest mortality till then recorded. (Daily Mail Year Book, 1915.) The more recently issued satitics for reveal a till higher death rate.
Compare figures given for tea-consumption in Thorpe's "Dictionary of Applied Chemistry," art. Tea, with the Cancer Tables in Burns's "Vital Statistics Explained." (London: Constable, 1914.)
Meldola, loc. cit., p. 98.
Haas, and Hill, "Chemistry of Plant Products." (London: Longmans, Green, and Co., 1913.)