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Updated: June 28, 2025
In addition to the active vents, there are here several hundred very perfect volcanic cones, many of which appear to have recently become extinct, though some of them may be merely dormant, biding their time. A third series of volcanoes starts from the neighborhood of Behring's Straits, and stretches along the whole western coast of the American continent.
The lofty ones are intermittent a century, two, ten, of silent waiting, and then their talk silenced for ever some poor district; the low ones are constant in action. Who could know the dark way of the world? Sometimes they form a linear system, consisting of several vents which extend in one direction, near together, like chimneys of some long foundry beneath.
We found a few boxes of smooth-bore muskets which had once been issued to militia companies and had been returned rusted and damaged. No belts, cartridge-boxes, or other accoutrements were with them. There were two or three smooth-bore brass fieldpieces, six-pounders, which had been honeycombed by firing salutes, and of which the vents had been worn out, bushed, and worn out again.
I added, that when a country had been long subject to frequent shocks, new subterranean communications seemed to open with neighbouring countries; and that the volcanoes of the West India Islands, lying in the direction of the Silla, north-east of the city, were perhaps the vents, at the time of an eruption, for those elastic fluids which cause earthquakes on the coasts of the continent.
How shall one know whether the sound comes up a wrathful gullet or whether the dog bays at him impersonally, as at the distant moon? Or maybe he vents himself upon a stubborn cow. Surely it is not an idle tune he practices. He holds a victim in his mind. There is sour venom on his churlish tooth.
The most noteworthy feature in the distribution of volcanoes is that, at the present time at least, all active vents are limited to the sea floors or to the shore lands within the narrow range of three hundred miles from the coast.
In marine flue boilers of good construction the vent varies between the limits of 20 and 25, according to the size of the boiler and other circumstances the largest boilers having generally the largest vents; and the calorimeter divided by the vent will give the length of the flue in feet.
To rush to the chimney, to ascend it at the risk of suffocation, were the only means which seemed to have occurred to him; but his progress was speedily stopped by one of those iron gratings, which are, for the sake of security, usually placed across the vents of buildings designed for imprisonment.
Although the shores of the Bay of Naples have remained in general with unchanged elevation for about two thousand years, they have here and there been subjected to slight oscillations which are most likely connected with the movement of volcanic matter toward the vents where it is to find escape.
From the length of the lower-deck guns they could not be easily run in, while the 12-pounders on the main-deck were so old and their vents so large that much powder exploded through them.
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