Cronaca Del Vesuvio: Sommario Della Storia De' Principali Accendimenti Del Vesuvio Dal 1840 Fino Al 1871, Sequ?ta Da Estesa Relazione Dell' Ultimo Incendio Del 1872
Cronaca Del Vesuvio: Sommario Della Storia De' Principali Accendimenti Del Vesuvio Dal 1840 Fino Al 1871, Sequ?ta Da Estesa Relazione Dell' Ultimo Incendio Del 1872
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1873 edition. Excerpt: ...are such as arise from water admitted to a preescistent focus of high temperature. Whether sea or fresh water is not material, when we bear in mind that the chemical constituents found in sea water and in natural fresh waters that have penetrated the soil are, on the whole, alike in kind and only ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1873 edition. Excerpt: ...are such as arise from water admitted to a preescistent focus of high temperature. Whether sea or fresh water is not material, when we bear in mind that the chemical constituents found in sea water and in natural fresh waters that have penetrated the soil are, on the whole, alike in kind and only differ in proportions. But I must pass almost without notice all the varied and instructive phenomena which are presented by volcanic vents, for to treat of these at all would be to more than double the size of this sketch. In the source that has been pointed out as that from which volcanic heat itself is derived, viz., the secular cooling of our glebe, and the effects of that upon its solid shell, we are enabled to point to that which is the surest test of the truth of any theory--that it not only enables us to account for all the phenomena, near or remote, but to predict them. We see here linked together as parts of one grand play of forces, those of contraction by cooling, producing by direct mechanical action the elevation of mountain chains, and by their indirect action, by transformation of mechanical work into heat, the production of Volcanoes; and both by direct and by indirect action, of Earthquakes, never previously shown to have thus the physical connection of one common cause, but merely supposed, more or less, to be connected by their distribution upon our earth's surface. "We now discern thus the physical cause why Volcanoes are distributed, viewed largely, linearly, and follow the lines of elevation; we see equally why their action is uncertain, non-periodic, fluctuating in intensity, with longer or shorter periods of repose, shifting in position, becoming extinct here, appearing in new activity or for the first time there. We have...
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