A Description of Active and Extinct Volcanos: With Remarks on Their Origin, Their Chemical Phaenomena, and the Character of Their Products, as Determined by the Condition of the Earth During the Period of Their Formation. Being the Substance of Some Lectures Delivered Before the University of Oxford, with Much Additional Matter |
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Page ix
... thrown on the nature of Trap and Basaltic Districts , than by the labours of Dr. Macculloch and of other English Geologists ; to some of whom I feel personally indebted , either for much of the information which forms the ground work of ...
... thrown on the nature of Trap and Basaltic Districts , than by the labours of Dr. Macculloch and of other English Geologists ; to some of whom I feel personally indebted , either for much of the information which forms the ground work of ...
Page 12
... thrown across them , the projecting por- tions of which appear like islands in the midst . The stream of lava that has occasioned this impediment appears to have been furnished by one of three mountains , all of which have given out ...
... thrown across them , the projecting por- tions of which appear like islands in the midst . The stream of lava that has occasioned this impediment appears to have been furnished by one of three mountains , all of which have given out ...
Page 18
... thrown up from a great depth by the same agent to which they owe their mineralogical characters . Again it may be asked , whether admitting the latter view of the case to be the correct one , we are to suppose each of the domite hills ...
... thrown up from a great depth by the same agent to which they owe their mineralogical characters . Again it may be asked , whether admitting the latter view of the case to be the correct one , we are to suppose each of the domite hills ...
Page 19
... of bornblende rock , by supposing that it formed beds in the granite which was thrown up , whilst the unequal operation of heat may explain the occurrence of the latter substance B 2 On the Post - diluvial Volcanic Rocks near Clermont . 19.
... of bornblende rock , by supposing that it formed beds in the granite which was thrown up , whilst the unequal operation of heat may explain the occurrence of the latter substance B 2 On the Post - diluvial Volcanic Rocks near Clermont . 19.
Page 28
... thrown out since the existence of the present order of things , would have been found at the bottom of the vallies by which the country is intersected . 2. The trachytic formation is essentially composed of crystals of glassy felspar ...
... thrown out since the existence of the present order of things , would have been found at the bottom of the vallies by which the country is intersected . 2. The trachytic formation is essentially composed of crystals of glassy felspar ...
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Common terms and phrases
alluded analogy antient appear augite Auvergne basalt beds Breislac Buch calcareous called carbonic acid cause cavities cellular characters colour compact composed cones conglomerate conical consider consist containing covered crater crystals dykes earth earthquakes ejected eruption Etna exhalations existence feet felspar fire formation formed former fragments geological glassy felspar granite heat hills hornblende Humboldt Hungary igneous Ischia island lake latter lava leucite likewise limestone Lipari mass Memoir midst miles minerals modern Mount Mount Etna mountain muriatic Naples nature neighbourhood noticed observed obsidian occur origin period phænomena phænomenon Phlegrean fields pitchstone porphyry portion present probably pumice remarks respect rise Santorino scoriæ scoriform seems seen Sicily side Solfatara spot stone Strabo strata stream of lava structure Styria substance sulphur sulphuretted hydrogen summit supposed surface tain tertiary thrown tion trachyte tuff valley vapours Vesuvius vitreous volcanic action volcanic matter volcanic products volcanic rocks whilst δε
Popular passages
Page 279 - Behold, I am against thee, O destroying mountain, saith the Lord, which destroyest all the earth: and I will stretch out mine hand upon thee, and roll thee down from the rocks, and will make thee a burnt mountain.
Page 326 - The sides of the gulf before us, although composed of different strata of ancient lava, were perpendicular for about 400 feet, and rose from a wide horizontal ledge of solid black lava of irregular breadth, but extending completely round. Beneath this ledge the sides sloped gradually towards the burning lake, which was, as nearly as we could judge, 300 or 400 feet lower. It was evident, that the large crater had been recently filled with liquid lava up to this black ledge, and had, by some subterranean...
Page 322 - From midnight till the evening of the llth, they continued without intermission ; after that time their violence moderated, and they were heard only at intervals, but the explosions did not cease entirely till the 15th of July. Of all the villages round Tomboro, Tempo, containing about forty inhabitants, is the only one remaining. In Pekate...
Page 325 - The bottom was covered with lava, and the south-west and northern parts of it were one vast flood of burning matter, in a state of terrific ebullition, rolling to and fro its " fiery surge
Page 278 - Oh that thou wouldest rend the heavens, that thou wouldest come down, that the mountains might flow down at thy presence. As when the melting fire burneth, the fire causeth the waters to boil, to make thy name known to thine adversaries, that the nations may tremble at thy presence...
Page 325 - ... and flaming billows. Fifty-one conical islands, of varied form and size, containing so many craters, rose either round the edge or from the surface of the burning lake. Twenty-two constantly emitted columns of grey smoke, or pyramids of brilliant flame : and several of these at the same time vomited from their ignited mouths streams of lava, which rolled in blazing torrents down their black indented sides into the boiling mass below.
Page 337 - A vast plain extends from the hills of Aguasarco, to near the villages of Teipa and Petatlan, both equally celebrated for their fine plantations of cotton. This plain, between...
Page 129 - ... inquit >frondoso vertice collem/ - quis deus, incertum est - habitat deus...
Page 324 - ... feet below its original level. The surface of this plain was uneven, and strewed over with large stones and volcanic rocks, and in the centre of it was the great crater, at the distance of a mile and a half from the precipice on which we were standing.
Page 191 - Wheb a shock is felt, when the earth is shaken on it-s old foundations, which we had deemed so stable, one instant is sufficient to destroy long illusions. It is like awakening from a dream; but a painful awakening.