Duncan, Robert Kennedy, 1868-1914. The new knowledge : a sample exposition of the new physics and th e new chemistry in their relation to the new theory of matter / Robe rt Kennedy Duncan - New York : A.S. Barnes & company, 1914 - xviii, [2] , 263 p. : ill. , diagrs. ; 21 cm. Includes index Subjects--Topical Terms: Radioactivity.Matter--Constitution.Ions.Astrophysics. Dewey Class. No.: 539.7