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Orders of Validity in Geological Theory
Published online by Cambridge University Press: 01 May 2009
Extract
All of us have read how, in the infancy of modern geology, men were exceeding liberal of theorizing; indeed, it might almost be said that their theorizing, and their confidence in it, were in inverse proportion to their knowledge. Then arose the Geological Society of London, with its appeal for “new facts” and for “investigating the mineral structure of the Earth”, in other words, for application of the inductive method, and for placing geological inductions upon as broad a basis as possible. The result of which we know; the science went forward from that hour.
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1 I venture to suggest this as a convenient term for the interior of the Earth, within that shell for which we already use the term Lithosphere. We should then have Endosphere and Ectosphere, the latter being divisible into Lithosphere, Hydrosphere, and Atmosphere.
2 If I may venture to offer a suggestion, it would be that none of us would be the worse for mastering Mill's classic work called A System of Logic; or if that be a little too voluminous, the summary of parts of it which is given in Jevons' Elementary Lessons in Logic. But Mill's original is to be recommended.