Chapter IX

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—— _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.
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—— _Proc. Roy. Soc. A._, Vol. LXXXIV, p. 377. 1910.
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