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<p>Current conceptions.-- The periodic law.-- Gaseous ions.-- Natural radio0activity; a new property of matter.--The resolution of the atom.-- Inorganic evolution.-- The new knowledge and old problems
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<br>Subjects: Radioactivity; Matter -- Constitution; Ions; Astrophysics; Periodic law</div>
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Duncan, Robert Kennedy, 1868-1914</div>
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