Chapter III

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Croll. _Phil. Mag._ May, 1868.
—— _Climate and Time._ 1875.
De Geer. _Geol. Fören i Stockholm Föhr Band 32._ 1910.
Gilbert. _Journ. of Geol._, Vol. III, p. 121. 1895.
Lowell. _Evolution of Worlds_, p. 197. 1910.
Sederholm. _Bull. Comm. Géol. de Finlande_, No. 30, pp. 7-15. 1911.
Sollas. _Ancient Hunters._ 1911.