The History of Devonshire

The History of Devonshire

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1829 edition. Excerpt: ...tract appear chiefly to belong to the following heads of Dr. Macculloch's "Synopsis of granite." Future investigations will probably supply many other varieties; and also determine whether those of each kind which contain Cleavelandite, must not be considered as distinct from the rest., . i" First Division. Synopsis of Of two ingredients. the Devon B. Quartz, and felspar. g e, b. The quartz, or felspar, or both, imperfectly crystal lized and influencing each other's forms. Graphic granite. Second Divison. Of three ingredients: A. Quartz, felspar, and mica. a. An uniform mixture of the different ingredients. b. Distinct additional crystals of felspar imbedded in the general mixture: porphyritic granite. d. The quartz, or the felspar, or the mica, or all of them crystallized. Appendix. D. Schorl and quartz, sometimes with felspar. Schorl rock. " Geological Classification of Rocks," by J. Macculloch, M.D. F.R, S. p. 234-242. The facts and arguments by which Dr. Macculloch has CHAP. inferred the concentric-spheroidal structure of the granite of " the West of England, from the phaenomena of its disinte-Concentric oration, and the consequent change of form of its masses, structure hare already been cited, p. 256-262; as well as Prof.;e gra" Sedgwick's and Dr. Berger's account of the fissures in that rock, which denote the earlier stages of its decomposition, p. 252-253, and p. 269. Some further remarks may here be added, arising from a general review of this interesting subject, so far as relates to the actual configuration of the granite masses, and the suppositions which have been entertained that their forms are the result of human ingenuity and labour, exerted, at a remote period, in the support of idolatry and...show more

Product details

  • Paperback | 194 pages
  • 189 x 246 x 10mm | 354g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236509285
  • 9781236509284