Edinburgh New Philosophical Journal edinburghnewphil34edin Year: 1843 - 1843 36 Mr Maclaren on Coral Islands and Reefs, as and shells, accumulate till they form a bank rising from six to twelve feet above high water, with the highest side towards the sea, from which the surface slopes inward to the lagoon. The ordinary width of these islets is under a quarter of a mile, and their length varies from a few yards to several miles. In the above cut, No. 1 is a plan of Keeling Atoll, in S. latitude 12°., and E. longitude °, the structure of which Mr Darwin examined with peculiar care. a,
Edinburgh New Philosophical Journal edinburghnewphil34edin Year: 1843 - 1843 36 Mr Maclaren on Coral Islands and Reefs, as and shells, accumulate till they form a bank rising from six to twelve feet above high water, with the highest side towards the sea, from which the surface slopes inward to the lagoon. The ordinary width of these islets is under a quarter of a mile, and their length varies from a few yards to several miles. In the above cut, No. 1 is a plan of Keeling Atoll, in S. latitude 12°., and E. longitude °, the structure of which Mr Darwin examined with peculiar care. a, d, b, r, i, t,f, the coral reef; the scale being ^ of an inch to the mile, the largest diameter of the atoll is 9 miles, and the shortest 7. N, the lagoon, which, a little northward of the centre, is 8 fathoms deep, as marked in the figure. The part south of the dotted line is nearly dry at low water. i, t, the dark space here on the surface of the reef, is a long narrow islet of an irregular figure. There are other two between 6 and r; smaller ones at/, d, and a; and others of very minute size between/and t. There is a wide breach in the reef between h and d, and a narrower one between d and a, either of which admits a ship.
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