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Updated: May 7, 2025
On the beach within the reef, the rolled fragments consisted chiefly of the corals just mentioned, and of a massive Porites, like that at Keeling atoll, of a Meandrina, Pocillopora verrucosa, and of numerous fragments of Nullipora.
In this course we have seen, that in the lapse of ages encircling barrier-reefs are occasionally converted into atolls, the name of atoll being properly applicable, at the moment when the last pinnacle of encircled land sinks beneath the surface of the sea.
P.S. It is now two weeks since the foregoing was written, and Tehei, the only immune on board has been down ten days with far severer fever than any of us and is still down. His temperature has been repeatedly as high as 104, and his pulse 115. P.S. At sea, between Tasman atoll and Manning Straits.
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.
On the western side, also, of the atoll, where I have described a bed of sand and fragments with trees growing out of it, in front of an old beach, it struck both Lieutenant Sulivan and myself, from the manner in which the trees were being washed down, that the surf had lately recommenced an attack on this line of coast.
Mahlos Mahdoo, therefore, is in every respect in so intermediate a condition, that it may be considered either as a single atoll nearly dissevered into three portions, or as three atolls almost perfect and intimately connected. This is an instance of a very early stage of the apparent disseverment of an atoll, but a still earlier one in many respects is exhibited at Tilla-dou- Matte.
On the bottom of the huge and glassy lagoon was much pearl shell, and from the deck of the schooner, across the slender ring of the atoll, the divers could be seen at work. But the lagoon had no entrance for even a trading schooner. With a favoring breeze cutters could win in through the tortuous and shallow channel, but the schooners lay off and on outside and sent in their small boats.
In D'Urville and Lottin's chart, SYDENHAM is written with a capital letter, signifying that it is high; but this certainly is not the case, for it is a perfectly characterised atoll, and a sketch, showing how low it is, is given in the "'Coquille's' Atlas." Some narrow strip-like reefs project from the southern side of DRUMMOND atoll, and render it irregular. Mr.
In the meantime, Nauri, torn from her family by the hurricane, had been swept away on an adventure of her own. Clinging to a rough plank that wounded and bruised her and that filled her body with splinters, she was thrown clear over the atoll and carried away to sea. Here, under the amazing buffets of mountains of water, she lost her plank.
"There she comes," he said quietly. They did not need glasses to see. A flying film, strangely marked, seemed drawing over the surface of the lagoon. Abreast of it, along the atoll, travelling with equal speed, was a stiff bending of the cocoanut palms and a blur of flying leaves. The front of the wind on the water was a solid, sharply defined strip of dark-coloured, wind-vexed water.
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