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Published online by Cambridge University Press: 01 May 2009
The article by Mr. Clifton Ward upon “Rock Fissures” in the GeologicalMagazine for June, has reminded me of a special characteristic of some igneous rocks, which has been perhaps as yet imperfectly appreciated. I mean by igneous rocks, such masses of subterranean, mineral matter as have apparently thrust themselves upwards to the surface of the globe by a process of internal expansion or intumescence, caused by heat —not always attaining absolute fusion, but in some degree owing to the general permeation of the matter by super-heated water, or steam, or other gases.
page 293 note 1 See Volcanos, p. 287, ed. 1872.
page 294 note 1 See Lyell's Principles, ed. 1872, p. 233.
page 294 note 2 Volcanos, ed. 1825, p. 30
page 295 note 1 See Volcanos, pp. 275–287, ed. 1872.