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Add to these the cases of Iceland and the volcanic islands of the Pacific, and we have almost the whole of the very active volcanoes of the world. Then for the purposes of our inquiry we have to ascertain how these active vents of eruption compare, as regards the magnitude of their operations, with those of the pre-historic and later Tertiary times.
So he withdrew the four crews from their hose vents, ordered two of them to take their lines into the second hold, and set the others flooding the deck. He shifted two of his seven-inch steam lines to the midship plugs, and then followed the hose men, who had joined their comrades in the darkness of the second hold.
Thus the Neapolitan Group, which might at first sight seem to be arranged round Vesuvius as a centre, really resolves itself into a line of active and extinct vents of eruption, ranging across Italy from the Tyrrhenian Sea to the Adriatic, through Ischia, Procida, Monte Nuovo and the Phlegræan Fields, Vesuvius, and Mount Vultur.
«Le faite de la montagne, battu de tous cotés par les vents, et par les pluies, a souffert des altérations les plus grandes: ici les couches du coté du lac ont été detruites, et laissent voir les sommités des couches opposées, dont les escarpemens paroissent tourner contre ce même lac; l
Carlyle made his second visit to London to seek types for Sartor, in vain. Always preaching reticence with the sound of artillery, he vents in many pages the rage of his chagrin at the "Arimaspian" publishers, who would not print his book, and the public which, "dosed with froth," would not buy it. The following is little softened by the chiaroscuro of five-and-thirty years:
Sanford and Le Blanc, one at each of the propellers, gave them a few twists, and after about the third silent revolution there came the startling roar of the exhaust that told the boys that all the cylinders were getting down to work. Blue flames and smoke belched out of the vents and the mechanics sprang back, as the propellers whirled round at a pace that made them seem blurred shadows.
Pistons smoothly turned, rubbed with oil, and inserted from above into the cylinders, work with their rods and levers upon the air and water in the cylinders, and, as the valves stop up the openings, force and drive the water, by repeated pressure and expansion, through the vents of the pipes into the vessel, from which the cowl receives the inflated currents, and sends them up through the pipe at the top; and so water can be supplied for a fountain from a reservoir at a lower level.
In the cruder states of social life not only is imagination more frequently predominant over all other faculties, but it has not the healthful vents which the intellectual competition of cities and civilization affords. The man who in a savage tribe, or in the dark feudal ages, would be a magician, is in our century a poet, an orator, a daring speculator, an inventive philosopher.
The numerous vents which had previously been noticed on Krakatoa must at that moment have been blown into one, and the original crater of the old volcano said to have been about six miles in diameter must have resumed its destructive work.
Owing to this cause, the enclosed molten matter is more or less abundantly extruded from time to time along the lines and vents of eruption, so as to accommodate itself to the ever-contracting crust. Nor can we doubt that this process has been going on from the very earliest period of the earth's history, and formerly at a greater rate than at present.
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