. Elements of geology : a text-book for colleges and for the general reader. Geology. manner by deposits of the same, in the form of scalloped embroidery set with pearly tubercles; in others the siliceous deposits take the most fantastic forms (Figs. 85, 86, 87). In some places the silica is deposited in large quantities, three or four inches deep, in a gelatinous condition like starch-paste. Trunks and branches of trees immersed in these waters are speedily petrified. We can only mention a few of the grandest of these geysers : 1. The " Grand Geyser," according to Hayden, throws up
. Elements of geology : a text-book for colleges and for the general reader. Geology. manner by deposits of the same, in the form of scalloped embroidery set with pearly tubercles; in others the siliceous deposits take the most fantastic forms (Figs. 85, 86, 87). In some places the silica is deposited in large quantities, three or four inches deep, in a gelatinous condition like starch-paste. Trunks and branches of trees immersed in these waters are speedily petrified. We can only mention a few of the grandest of these geysers : 1. The " Grand Geyser," according to Hayden, throws up a column of water six feet in diameter to the height of 200 feet, while the steam ascends 1,000 feet or more. The eruption is repeated every thirty-two hours, and lasts twenty min- utes. In a state of quiescence the tem- perature of the water at the surface is about 150°. 2. The " Giantess " throws up a large column twenty feet in diameter to a height of sixty feet, and through this great mass it shoots up five or six lesser jets to a height of 250 feet. Its erup- tions are fitful but last sometimes several hours. 3. The "Giant" (Fig. 88) throws a column five feet in diameter 140 feet high, and plays continuously for three hours. 4. The " Bee - Hive " (Fig. 89), so called from the shape of its mound, shoots up a splendid column two or three feet in diameter to the height by measurement of 219 feet, and plays fifteen minutes. 5. " Old Faithful," so called from the frequency and regularity of its eruptions, throws up a column six feet in diameter to the height of 100 to 150 feet regularly every hour, and plays each time fifteen minutes. Theories of Geyser-Eruption.—The water of geysers is not volcanic water, but simple spring-water. A geyser is not, therefore, a volcano ejecting water, but a true spring. There has been much speculation concerning the cause of their truly wonderful eruptions. Mackenzie's Theory.—According to Mackenzie,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
