CHAPTER VII

Mme. Curie. _Traité de Radioactivité._ 1910. Ramsay and Soddy. _Proc. Roy. Soc. A._, Vol. LXXII, p. 204. 1903. Russell. _Proc. Roy. Soc. A._, Vol. LXXXVI, p. 240. 1912. Rutherford. _Radioactive Substances._ 1912. Rutherford and Soddy. _Phil. Mag._, Vol. IV, p. 582. 1902. Rutherford and Geiger. _Proc. Roy. Soc. A._, 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.