RADIO-ACTIVE SUBSTANCES. BY MDME. SKLODOWSKA CURIE. Thesis presented to the Faculté des Sciences de Paris. _Reprinted from the CHEMICAL NEWS._ (SECOND EDITION). LONDON: _CHEMICAL NEWS_ OFFICE, 16, NEWCASTLE STREET, FARRINGDON STREET, E.C. 1904. D. VAN NOSTRAND COMPANY, 23 MURRAY AND 27 WARREN STREETS, NEW YORK. ------------------------------------------------------------------------ A. C. COSSOR, 54, Farringdon Road, E.C. [Illustration] SPINTHARISCOPES, AS DEVISED BY SIR WILLIAM CROOKES. Showing the Scintillations of Radium. PRICE 21s. each. [Illustration] PURE RADIUM BROMIDE, when available PITCHBLENDE and THORIUM NITRATE. [Illustration] OZONE GENERATOR, Complete, With 1 in. spark coil, £2 17s. 6d. =CROOKES’S HIGH VACUUM TUBES=, showing the fluorescence of various minerals. A good selection always in stock, including several specialities. SPECTRUM TUBES, GLASS BLOWING, “X-RAY” OUTFITS and TUBES, HIGH FREQUENCY APPARATUS and APPLICATORS, and other Scientific Instruments. _Experimental work of any kind in Glass or Metal._ * * * * * RADIUM SALTS and Other Preparations and Minerals. =Radium Bromide=, =Radium-Barium Bromide=, =Radium-Barium Chloride=, in Tubes of various quantities and strengths. =Phosphorescent Zinc Sulphide=, 1 grm. and 5 grm. Tubes, and per oz. =Phosphorescent Zinc Sulphide=, Screens. =Radium=, Active Screens for Photographic effects. =Uranium Platino-cyanide Screens=, from 7 × 5 to 15 × 11. =Pitchblende=, Selected Radio-Active. =Willemite=, =Autunite=, and other Fluorescent Minerals. Salts of =Uranium=, =Thorium=, =Calcium=, and other X-Ray Materials. (SUBJECT TO BEING UNSOLD.) Chemicals for Scientific Investigation and Laboratory Work. HARRINGTON BROS., 4, Oliver’s Yard, City Road, London, E.C. _MANUFACTURING CHEMISTS._ ------------------------------------------------------------------------ RADIO-ACTIVE SUBSTANCES BY MDME. SKLODOWSKA CURIE Thesis presented to the Faculté des Sciences de Paris. _Reprinted from the CHEMICAL NEWS._ (SECOND EDITION).