Travels in the Two Sicilies

Travels in the Two Sicilies

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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. 1798 edition. Excerpt: ...observations-of Gioeni on Etna certainly accord;-for, had he remarked the concurrence of such a circumfiance, he, undoubtedly, would have mentioned it. V-OL. 111. P-What First: that many bafaltiform lavas have assumed this organization on coagulating I ' A i within the sea. Secondly: that others have taken the same form: merely in cooling in the' open air.-Thirdly: that innumerable other lavas have not taken this fi-gure, either in the sea or in the air. It appears, at firsl: view, that these differcnces depend on the diflerent nature of the-lavas themselves. This opinion, at least, -is rendered probable by what we observe-in earths penetrated with water, which, in drying, -take, more or less, prismatic forms, as has been observed fre-. quently in the argillaceous kinds. Ihave seen, when-a turbid-torrent has been introduced-into a ditch through an argillaceous marle, s-the latter, in drying, divide, ' (art 'ii into 'polyhedrous pieces; but when the water passed through chalk, orscalcareous marle, the greater part of the pieces were amorphous. When we however observe lavas with requifite attention, this c'onformatio'n in them seems to' be efsefited tdifferently. Catania, which have for their base the horn-stone; though others extremely ref sembling them, between Jaci Reale and not a necessary condition in lavas, to this appropriate crysiallization. This has already been remarked by M. Dolomieu;. P 2 and I ' y X and I have observed that mahy amorphous lavas on the shores of several of the Eolian islands are more compact than the prismatic lavasiof Felicuda.. ' ' NVhat then can be the intrinfic circumstance of the lava which determines it thus to cleave in the prismatic form? I confess I am ignorant: and-who can say that we do not seek it in vain more

Product details

  • Paperback | 46 pages
  • 189 x 246 x 3mm | 100g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123663649X
  • 9781236636492