CHAPTER IX. Becker. _bull. Geol. Soc. Am._, P. 113. 1908.

Becker. Bull. Geol. Soc. Am., p. 113. 1908. —— Smith. Inst. Misc. Collect., Vol. LVI, No. 6.

Buchner. Proc. Konink. Akad. van Wetensch. te Amsterdam. October, 1910, February, 1911, and April, 1912. Chamberlin. Journ. Geol., p. 674. 1911. Eve and McIntosh. Phil. Mag. August, 1907. —— Trans. Roy. Soc. Canada, p. 69. 1910. Farr and Florance. Phil. Mag. November, 1909. Fletcher. Phil. Mag. July, 1910. —— Phil. Mag. January, 1911. —— Phil. Mag. June, 1911. —— Phil. Mag. February. 1912. Joly. Rep. Brit. Ass., p. 677. 1908. —— Radioactivity and Geology, 1909. —— Phil. Mag. October, 1909. —— Phil. Mag. July and August, 1910. —— Phil. Mag. July, 1911. —— Cong. Internat. de Rad. and d’Elec., p. 370. 1911. —— Phil. Mag. February, 1912. —— Phil. Mag. October, 1912. King. Am. Journ. Science, p. 1. 1893. Strutt. Proc. Roy. Soc. A., Vol. LXXIX, p. 472. 1906. —— Proc. Roy. Soc. A., Vol. LXXXIV, p. 377. 1910. Suzuki. Proc. Math.-Phys. Soc., Tokyo, p. 204. 1912.