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Updated: June 15, 2025
Although the limit of depth, at which each particular kind of coral ceases to exist, is far from being accurately known; yet when we bear in mind the manner in which the clumps of coral gradually became infrequent at about the same depth, and wholly disappeared at a greater depth than twenty fathoms, on the slope round Keeling atoll, on the leeward side of the Mauritius, and at rather less depth, both without and within the atolls of the Maldiva and Chagos Archipelagoes; and when we know that the reefs round these islands do not differ from other coral formations in their form and structure, we may, I think, conclude that in ordinary cases, reef-building polypifers do not flourish at greater depths than between twenty and thirty fathoms.
Hold in mind the image of these two obliquely ranged archipelagoes, their length thrice their breadth, seaming the blue of the sea, and garmented in dark green and purple under the sunshine; and, thinking of them thus, picture to yourself a new rising of the land, a new withdrawal of the waters, the waves falling and ever falling, till all the hills come forth again, and the salt tides roll and ripple away from the valleys, leaving their faces for the winds to dry; let this go on till the land once more takes its familiar form, and you will easily call up the visible image of the whole.
Von Buch does not include in his class of volcanic chains small archipelagoes, in which the islands are admitted by him, as at the Azores, to be arranged in lines; but when viewing on a map of the world how perfect a series exists from a few volcanic islands placed in a row to a train of linear archipelagoes following each other in a straight line, and so on to a great wall like the Cordillera of America, it is difficult to believe that there exists any essential difference between short and long volcanic chains.
Though terrestrial mammals do not occur on oceanic islands, aerial mammals do occur on almost every island. New Zealand possesses two bats found nowhere else in the world: Norfolk Island, the Viti Archipelago, the Bonin Islands, the Caroline and Marianne Archipelagoes, and Mauritius, all possess their peculiar bats.
Boyd naturally spoke of his projects to Sterling, of his gun-brig lying in the Irish creek, among others. Sterling naturally said, "If you want an adventure of the Sea-king sort, and propose to lay your money and your life into such a game, here is Torrijos and Spain at his back; here is a golden fleece to conquer, worth twenty Eastern Archipelagoes."
I might have referred to other authorities regarding these three archipelagoes; but after the publication of the charts by Captain Moresby, to whose personal kindness in giving me much information I am exceedingly indebted, it would have been superfluous.
Laghouat was Owen's destination; from thence he could proceed farther into the desert and wander among the different archipelagoes until the summer drove him northward. The sale of the camels if not their sale, their hire for so many months was the subject of a long dispute in which Owen was advised not to interfere.
With respect to the age at which the several parallel ridges composing the Cordillera were upthrown, I have little evidence. Many of them may have been contemporaneously elevated and injected in the same manner as in volcanic archipelagoes lavas are contemporaneously ejected on the parallel lines of fissure.
He called one to him in the grey morning watch, when the day was just breaking, and taking his hand, said that while in Nantucket he had chanced to see certain little canoes of dark wood, like the rich war-wood of his native isle; and upon inquiry, he had learned that all whalemen who died in Nantucket, were laid in those same dark canoes, and that the fancy of being so laid had much pleased him; for it was not unlike the custom of his own race, who, after embalming a dead warrior, stretched him out in his canoe, and so left him to be floated away to the starry archipelagoes; for not only do they believe that the stars are isles, but that far beyond all visible horizons, their own mild, uncontinented seas, interflow with the blue heavens; and so form the white breakers of the milky way.
For a long time the old geographers had had for their guidance only the charts of missionaries who, lacking alike the education and the appliances necessary to estimate accurately the size, position, and relative distance of all these archipelagoes, had attached notable importance to them, and often fixed at a considerable number of degrees the extent of a group which covered only a few miles.
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