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                        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,

       