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PUMICE is a light, spongy, fibrous substance, produced by the action of gases on trachytic and other lavas; the relation, however, of its origin to the composition of lava is not yet well understood. Von Buch says that it never occurs where only labrador-feldspar is present.
I vill gif you pay for eet all for the child. An' here ees one dollar mo' from Billy Buch. Now go, goot voman." The other interruption was the redoubtable Mrs.
Von Buch, Escher, and Studer inferred, from an examination of the mineral composition of the boulders, that those resting on the Jura, opposite the lakes of Geneva and Neufchatel, have come from the region of Mont Blanc and the Valais, as if they had followed the course of the Rhone to the lake of Geneva, and had then pursued their way uninterruptedly in a northerly direction.
The noble dames who were lodged there, seeing such multitudes rushing toward them, were exceedingly frightened. On this, the two lords and their company advanced to the gate of the market-place, which they had opened, and, marching under the banners of the Earl of Foix and Duke of Orleans, and the pennon of the Captal of Buch, posted themselves in front of this peasantry, who were badly armed.
Von Buch had observed that, at the peak of Teneriffe, near the northern limit of the trade-winds, there exists generally at the elevation of one thousand nine hundred toises, a contrary current from the west.
In Europe, the most southern glacier which comes down to the sea is met with, according to Von Buch, on the coast of Norway, in latitude 67 degrees. Now, this is more than 20 degrees of latitude, or 1230 miles, nearer the pole than the Laguna de San Rafael.
The next town where they halted was Schaffhausen, like Zurich, dear to them in the recollections of past visits. Here they examined the school for poor children in the town, and that of Buch in the neighborhood. They were delighted with both these institutions.
He describes how, sitting by the hearth in winter, he first learnt the art of minstrelsy from reading "das alte Buch" of the greatest of minstrels, Walther von der Vogelweide; then when the winter had passed he heard the birds in the green trees singing the selfsame song.
Vesuvius, during a long series of years, has also thrown out lavas without leucites: and if it be true, as M. von Buch has rendered very probable, that these crystals are formed only in the currents which flow either from the crater itself, or very near its brink, we must not be surprised at not finding them in the lavas of the peak.
This, according to Von Buch, holds good in a remarkable manner both at the Lipari Islands and on the Peak of Teneriffe; at this latter place obsidian has never flowed from a less height than 9,200 feet. Obsidian, also, appears to have been erupted from the loftiest peaks of the Peruvian Cordillera.
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