Principles of Geology ; Or, the Modern Changes of the Earth And Its Inhabitants Considered As Illustrative of Geology

Cover Principles of Geology ; Or, the Modern Changes of the Earth And Its Inhabitants Considered As Illustrative of Geology
Principles of Geology ; Or, the Modern Changes of the Earth And Its Inhabitants Considered As Illustrative of Geology
Lyell, Charles, Sir, 1797-1875
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Access of salt water to the volcanic foci, — ^Although the theory which assumes that water plays a principal part in volcanic operations does not necessarily imply the proximity of volcanic vents to the ocean, it seems still to follow naturally that the superficial outbursts of steam and lava will be most Digitized by Google 224 ACCESS OF SALT WATER TO VOLCANIC FOCL [CH.XXXin.
prevalent where there is an incumbent body of salt water, or in any regions rather than in the interior of a continent,
... where the quantity of rain-water is reduced to a minimum. The experiments and observations of the most eminent chemists have gradually removed, one after another, the objections which were first offered to the doctrine that the salt water of the sea plays a leading part in most volcanic eruptions.
Sir H. Davy observed that the fumes which escaped from the Vesuvian lava deposited common salt.* M. Gay-Lussac, although he avowed his opinion that the decomposition of water contributed largely to volcanic action, called attention, nevertheless, to the supposed fact, that hydrogen had not been detected in a separate form among the gaseous products of volcanos ; nor coidd it, he said, be present ; for, in that case, it would be seen inflamed in the air by the red-hot stones thrown out during an eruption.f But M.


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