Those who, by the disastrous chances of sea-voyages, happen to be condemned to a temporary habitation upon a rock in mid-ocean, find that the form of their inhospitable refuge is by no means a matter of indifference. There is the pyramidal-shaped rock, a single peak rising from the water; there is the circle rock somewhat resembling a round of great stones; and there is the corridor-rock. The latter is the most alarming of all. It is not only the ceaseless agony of the waves between its walls, or the tumult of the imprisoned sea; there are also certain obscure meteorological characteristics which appear to appertain to this parallelism of two marine rocks. The two straight sides seem a veritable electric battery.

The first result of the peculiar position of these corridor-rocks is an action upon the air and the water. The corridor-rock acts upon the waves and the wind mechanically by its form; galvanically, by the different magnetic action rendered possible by its vertical height, its masses in juxtaposition and contrary to each other.

This form of rock attracts to itself all the forces scattered in the winds, and exercises over the tempest a singular power of concentration.

Hence there is in the neighbourhood of these breakers a certain accentuation of storms.

It must be borne in mind that the wind is composite. The wind is believed to be simple; but it is by no means simple. Its power is not merely dynamic, it is chemical also; but this is not all, it is magnetic. Its effects are often inexplicable. The wind is as much electrical as aerial. Certain winds coincide with the _aurores boreales_. The wind blowing from the bank of the Aiguilles rolls the waves one hundred feet high; a fact observed with astonishment by Dumont-d'Urville. The corvette, he says, "knew not what to obey."

In the south seas the waters will sometimes become inflated like an outbreak of immense tumours; and at such times the ocean becomes so terrible that the savages fly to escape the sight of it. The blasts in the north seas are different. They are mingled with sharp points of ice; and their gusts, unfit to breathe, will blow the sledges of the Esquimaux backwards in the snow. Other winds burn. The simoon of Africa is the typhoon of China and the samiel of India. Simoon, typhoon, and samiel, are believed to be the names of demons. They descend from the heights of the mountains. A storm vitrified the volcano of Toluca. This hot wind, a whirlwind of inky colour, rushing upon red clouds, is alluded to in the Vedas: "Behold the black god, who comes to steal the red cows." In all these facts we trace the presence of the electric mystery.

The wind indeed is full of it; so are the waves. The sea, too, is composite in its nature. Under its waves of water which we see, it has its waves of force which are invisible. Its constituents are innumerable. Of all the elements the ocean is the most indivisible and the most profound.

Endeavour to conceive this chaos so enormous that it dwarfs all other things to one level. It is the universal recipient, reservoir of germs of life, and mould of transformations. It amasses and then disperses, it accumulates and then sows, it devours and then creates. It receives all the waste and refuse waters of the earth, and converts them into treasure. It is solid in the iceberg, liquid in the wave, fluid in the estuary. Regarded as matter, it is a mass; regarded as a force, it is an abstraction. It equalises and unites all phenomena. It may be called the infinite in combination. By force and disturbance, it arrives at transparency. It dissolves all differences, and absorbs them into its own unity. Its elements are so numerous that it becomes identity. One of its drops is complete, and represents the whole. From the abundance of its tempests, it attains equilibrium. Plato beheld the mazy dances of the spheres. Strange fact, though not the less real, the ocean, in the vast terrestrial journey round the sun, becomes, with its flux and reflux, the balance of the globe.

In a phenomenon of the sea, all other phenomena are resumed. The sea is blown out of a waterspout as from a syphon; the storm observes the principle of the pump; the lightning issues from the sea as from the air. Aboard ships dull shocks are sometimes felt, and an odour of sulphur issues from the receptacles of chain cables. The ocean boils. "The devil has put the sea in his cauldron," said De Ruyter. In certain tempests, which characterise the equinoxes and the return to equilibrium of the prolific power of nature, vessels breasting the foam seem to give out a kind of fire, phosphoric lights chase each other along the rigging, so close sometimes to the sailors at their work that the latter stretch forth their hands and try to catch, as they fly, these birds of flame. After the great earthquake of Lisbon, a blast of hot air, as from a furnace, drove before it towards the city a wave sixty feet high. The oscillation of the ocean is closely related to the convulsions of the earth.

These immeasurable forces produce sometimes extraordinary inundations. At the end of the year 1864, one of the Maldive Islands, at a hundred leagues from the Malabar coast, actually foundered in the sea. It sunk to the bottom like a shipwrecked vessel. The fishermen who sailed from it in the morning, found nothing when they returned at night; scarcely could they distinguish their villages under the sea. On this occasion boats were the spectators of the wrecks of houses.

In Europe, where nature seems restrained by the presence of civilisation, such events are rare and are thought impossible. Nevertheless, Jersey and Guernsey originally formed part of Gaul, and at the moment while we are writing these lines, an equinoctial gale has demolished a great portion of the cliff of the Firth of Forth in Scotland.

Nowhere do these terrific forces appear more formidably conjoined than in the surprising strait known as the Lyse-Fiord. The Lyse-Fiord is the most terrible of all the gut rocks of the ocean. Their terrors are there complete. It is in the northern sea, near the inhospitable Gulf of Stavanger, and in the 59th degree of latitude. The water is black and heavy, and subject to intermitting storms. In this sea, and in the midst of this solitude, rises a great sombre street--a street for no human footsteps. None ever pass through there; no ship ever ventures in. It is a corridor ten leagues in length, between two rocky walls of three thousand feet in height. Such is the passage which presents an entrance to the sea. The defile has its elbows and angles like all these streets of the sea--never straight, having been formed by the irregular action of the water. In the Lyse-Fiord, the sea is almost always tranquil; the sky above is serene; the place terrible. Where is the wind? Not on high. Where is the thunder? Not in the heavens. The wind is under the sea; the lightnings within the rock. Now and then there is a convulsion of the water. At certain moments, when there is perhaps not a cloud in the sky, nearly half way up the perpendicular rock, at a thousand or fifteen hundred feet above the water, and rather on the southern than on the northern side, the rock suddenly thunders, lightnings dart forth, and then retire like those toys which lengthen out and spring back again in the hands of children. They contract and enlarge; strike the opposite cliff, re-enter the rock, issue forth again, recommence their play, multiply their heads and tips of flame, grow bristling with points, strike wherever they can, recommence again, and then are extinguished with a sinister abruptness. Flocks of birds fly wide in terror. Nothing is more mysterious than that artillery issuing out of the invisible. One cliff attacks the other, raining lightning blows from side to side. Their war concerns not man. It signals the ancient enmity of two rocks in the impassable gulf.

In the Lyse-Fiord, the wind whirls like the water in an estuary; the rock performs the function of the clouds; and the thunder breaks forth like volcanic fire. This strange defile is a voltaic pile; the plates of which are the double line of cliffs.