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1 See Chemical Denudation in Relation to Geological Times, p. 57.
2 Dana, who, it seems (see Continents always Continents,“Nature,” March, 1881, p. 410), preceded Mr. Wallace in many of the views expressed in “Island Life,” estimates the average thickness of the sedimentary rocks in continental areas at 5 miles = 26,400 feet.
3 Abstract of a paper read by T. Sterry Hunt, LL.D., F.R.S., before the NationalAcademy of Science, at its meeting in Washington, April 17, 1883.