. Scientific American Volume 92 Number 04 (January 1905) . ell beconsidered an admirable text-book on the subject of Radio-Activity. Price of Scientific American Supplements, 10 Cents by Mail foreach number mentioned. Order through your newsdealer or from MUNN & CO., 361 Broadway, NEW YORK Radio-Activity and the Electron Theory. By Sir William Crookes. Scientific AmericanSupplement 1402. The Radio-Activity of Matter. By ProfessorHenri Becquerei. Scientific American Supple-ment 1379. Some Properties of the Radio-Active Sub-stances. By Professor Henri Becquerei.Scientific American Supplement 142

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. Scientific American Volume 92 Number 04 (January 1905) . ell beconsidered an admirable text-book on the subject of Radio-Activity. Price of Scientific American Supplements, 10 Cents by Mail foreach number mentioned. Order through your newsdealer or from MUNN & CO., 361 Broadway, NEW YORK Radio-Activity and the Electron Theory. By Sir William Crookes. Scientific AmericanSupplement 1402. The Radio-Activity of Matter. By ProfessorHenri Becquerei. Scientific American Supple-ment 1379. Some Properties of the Radio-Active Sub-stances. By Professor Henri Becquerei.Scientific American Supplement 142

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