Chapter VII

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Rutherford and Soddy. _Phil. Mag._, Vol. IV, p. 582. 1902.
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Vol. LXXXI, p. 151. 1908.
Rutherford and Royds. _Phil. Mag._, Vol. XVII, p. 281. 1909.
Whytlaw-Gray and Ramsay. _Proc. Roy. Soc. A._,
Vol. LXXXVI, p. 270. 1912.