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 xii
... Trachytic Lava 92 And of the Tuffs associated with it ...... 96 Production of Alum in these Rocks explained ... 97 Synopsis of Trachyte according to Beudant 101 Analogy to certain Rocks in Great Britain 104 LA Older Porphyries in ...
... Trachytic Lava 92 And of the Tuffs associated with it ...... 96 Production of Alum in these Rocks explained ... 97 Synopsis of Trachyte according to Beudant 101 Analogy to certain Rocks in Great Britain 104 LA Older Porphyries in ...
Page xix
... Trachyte ... ORIGIN OF TRACHYTE INVESTIGATED , by con- sidering its position ..... Extraneous substances imbedded in it Crystals found in it ............ . General characters S84 385 387 388 DEPTH AT WHICH THE VOLCANIC ACTION RESIDES ...
... Trachyte ... ORIGIN OF TRACHYTE INVESTIGATED , by con- sidering its position ..... Extraneous substances imbedded in it Crystals found in it ............ . General characters S84 385 387 388 DEPTH AT WHICH THE VOLCANIC ACTION RESIDES ...
Page xx
... Trachyte Its tuffs ... 409 410 Not formed from Mud eruptions 411 ... Formed with the help of water .. 412 But not by diluvial action .. 413 Their origin explained by considering the condition of the Earth's surface during this period ...
... Trachyte Its tuffs ... 409 410 Not formed from Mud eruptions 411 ... Formed with the help of water .. 412 But not by diluvial action .. 413 Their origin explained by considering the condition of the Earth's surface during this period ...
Page 7
... trachyte , which even when it has the colour of basalt , melts before the blowpipe into a white enamel , whilst the latter retains its original colour after being fused . As the only essential ingredient therefore of trachyte appears to ...
... trachyte , which even when it has the colour of basalt , melts before the blowpipe into a white enamel , whilst the latter retains its original colour after being fused . As the only essential ingredient therefore of trachyte appears to ...
Page 16
... trachyte , but of a more earthy character , and containing more rarely crystals of glassy felspar . These however do occur even in the most pulverulent part of the rock , and are common in the more compact portions , where indeed the ...
... trachyte , but of a more earthy character , and containing more rarely crystals of glassy felspar . These however do occur even in the most pulverulent part of the rock , and are common in the more compact portions , where indeed the ...
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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.