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Published online by Cambridge University Press: 01 May 2009
C. E. Dutton, in his paper on some of the greater problems of physical Geology (Bull. Phil. Soc. Washington, vol. xi, pp. 51–64, 1889–91), formulated his conception of Isostasy in the following words: “For this condition of equilibrium of figure to which gravitation tends to reduce a planetary body, irrespective of whether it be homogeneous or not, I propose the name of Isostasy. Isostasy is being disturbed by denudation and sedimentation …”
1 The words “solid” and liquid (or latent-liquid) are here used comparatively. The physical state of the liquid or latently liquid rock or magma may be left undiscussed here. See our Geodynamische Probleme, Berlin, 1924, I and II.
2 It seems appropriate to mention here that T. Mellard Reade calculated that the mere transition of rock from the solid to the liquid state in geosynclinal regions, consequent upon the piling up of sedimentary deposits in the G.S., would entail such expansion as sufficiently to account for the production of mountain-ranges. (T. Mellard Reade, The Evolution of Earth Structure, 1903, Longmans, Green, & Co., New York and London.)