[Footnote 97: Encyclopædia Britannica, 11th edition: article "Ocean."]
[Footnote 98: C. E. P. Brooks: The Meteorological Conditions of an Ice sheet and Their Bearing on the Desiccation of the Globe; Quart. Jour. Royal Meteorol. Soc., Vol. 40, 1914, pp. 53-70.]
[Footnote 99: Data of Geochemistry, Fourth Ed., 1920; Bull. No. 695, U. S. Geol. Survey.]
[Footnote 100: Quoted by Schuchert in The Evolution of the Earth.]
[Footnote 101: Smithsonian Physical Tables, Sixth Revision, 1914, p. 142.]
[Footnote 102: Chamberlin, in a very suggestive article "On a possible reversal of oceanic circulation" (Jour. of Geol., Vol. 14, pp. 363-373, 1906), discusses the probable climatic consequences of a reversal in the direction of deep-sea circulation. It is not wholly beyond the bounds of possibility that, in the course of ages the increasing drainage of salt from the lands not only by nature but by man's activities in agriculture and drainage, may ultimately cause such a reversal by increasing the ocean's salinity until the more saline tropical portion is heavier than the cooler but fresher subpolar waters. If that should happen, Greenland, Antarctica, and the northern shores of America and Asia would be warmed by the tropical heat which had been transferred poleward beneath the surface of the ocean, without loss _en route_. Subpolar regions, under such a condition of reversed deep-sea circulation, might have a mild climate. Indeed, they might be among the world's most favorable regions climatically.]
[Footnote 103: Encyclopædia Britannica: article "Ocean."]
[Footnote 104: Chamberlin and Salisbury: Geology, Vol. II, pp. 1-132, 1906; and T. C. Chamberlin: The Origin of the Earth, 1916.]
[Footnote 106: R. T. Chamberlin: Gases in Rocks, Carnegie Inst. of Wash., No. 106, 1908.]
[Footnote 107: J. Barrell: The Origin of the Earth, in Evolution of the Earth and Its Inhabitants, 1918, p. 44, and more fully in an unpublished manuscript.]
[Footnote 108: F. W. Clarke: Data of Geochemistry, Fourth Ed., 1920, Bull. No. 695, U. S. Geol. Survey, p. 256.]
[Footnote 109: F. W. Clarke: _loc. cit._, pp. 27-34 et al.]
[Footnote C: Chas. E. St. John: Science Service Press Reports from the Mt. Wilson Observatory, May, 1922.]