Transactions . Plomb et zinc, ManufacturRecord, 1906, page 467. Pratt, Joseph Hyde, Spath Fluoré et Cryolite, United States GeologicalSurvey : Mineral Resources oftht United States, 1904, page 1031. Rudler, F. W., un manuel à a. Collection des minéraux de l'île BritishIsland-!, principalement sélectionnés dans la collection Ludlam, au Musée de PracticalGeology, 1905. Smith, W. S. Tanger et E. O. Ulrich, les gisements de plomb, de zinc et De Spath Fluoré de Western Kentucky, United States Geological Surrey: Professional-Papers, no 36, 1905. Ure, Andrew, Dictionnaire de chimie et de minéralogie, 1831, pag

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Transactions . Lead, and Zinc, ManufacturersRecord, 1906, page 467. Pratt, Joseph Hyde, Fluorspar and Cryolite, United States GeologicalSurvey : Mineral Resources oftht United States, 1904, page 1031. Rudler, F. W., A Handbook to a. Collection of the Minerals of the BritishIsland-!, mostly selected from the Ludlam Collection, in the Museum of PracticalGeology, 1905. Smith, W. S. Tangier, and E. O. Ulrich, The Lead, Zinc, and Fluorspar-deposits of Western Kentucky, United States Geological Surrey: ProfessionalPapers, No. 36, 1905. Ure, Andrew, A Dictionary of Chemistry and Mineralogy, 1831, page 472. Watson, Thomas, Lead and Zinc-deposits of Virginia, Virginia GeologicalSurvey: Bulletins, No. 1, 1905, page 42. Wheeler, Geoige D., Zinc in Crittenden County, Kentucky, The Engineer-ing and Mining Journal [New York], 1902, vol. lxxiv., page 413. Hand>ook to the Collection <f British Pottery and Porcelain in the Museum ofPractical Geology, 1893. A Handbook to the Museum of Practical Geology, 1896.. Fi<;. 5. Paper-wekjht, turned and polished, made FROM WEARDALE FLUORSPAR. DISCUSSION OCCURRENCE AND COMMERCIAL USES OF FLUORSPAR. 231 Mr. F. W. Rudler (Loudon) wrote that it might not be with-out interest to call attention to the fact that the late Prof. M.Berthelot undertook some experiments on the colour of the violetfluorspar from TTeardale, which have been continued by his son, Prof. Daniel Berthelot. The colour was first discharged fromthe mineral by the application of heat, and the decolourisedfluorspar was then exposed to the prolonged action of a compoundof radium, when it was found that the violet tint was graduallyrestored. It would thus seem possible that the natural colour offluorspar might be largely influenced by the radioactive matterin the neighbouring rocks, as Prof. Bordas had suggested withregard to coloured corundums. The effect was believed to bedue to the gamma rays emitted by radium, which had greatpenetrating power, and might perhaps act special

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