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The hydrographical survey of this group, contained within a circumference of at least thirty leagues, was executed by M. Blois from the 24th to the 27th June. The islands are for the most part high, terminating in volcanic peaks; but some are of opinion, judging from the arrangement of the lagoon, that they are of madreporic formation.
The guns were very much out of repair, and when the remark was made to the old Spaniard who showed the fort, that they would not bear to be fired out of ONCE, with a shrug of his shoulders he replied that he thought they would bear it TWICE! But to return to Fort Concordia: it stands on a madreporic rocky eminence, about 60 feet in elevation, commanding the straggling town of Coepang, which, certainly, from the anchorage does not impress the stranger with a favourable opinion of the industry of its inhabitants, though it improves in proportion as you retreat from the beach.
Obviously its madreporic rocks had been made fertile by tornadoes and thunderstorms. One day, carried off by a hurricane from neighboring shores, some seed fell onto these limestone beds, mixing with decomposed particles of fish and marine plants to form vegetable humus. Propelled by the waves, a coconut arrived on this new coast. Its germ took root.
Charles Darwin, who thus explains the formation of atolls a theory superior, in my view, to the one that says these madreporic edifices sit on the summits of mountains or volcanoes submerged a few feet below sea level.
Mushroom-shaped fungus coral, some slate-colored sea anemone including the species Thalassianthus aster among others, organ-pipe coral arranged like flutes and just begging for a puff from the god Pan, shells unique to this sea that dwell in madreporic cavities and whose bases are twisted into squat spirals, and finally a thousand samples of a polypary I hadn't observed until then: the common sponge.
In general, that which rises above the waters is only breccia, or aggregate of madreporic fragments cemented by carbonate of lime, broken shells, and sand.
It likewise hugged Kiltan Island, a shore of madreporic origin discovered by Vasco da Gama in 1499 and one of nineteen chief islands in the island group of the Laccadives, located between latitude 10 degrees and 14 degrees 30' north, and between longitude 50 degrees 72' and 69 degrees east. By then we had fared 16,220 miles, or 7,500 leagues, from our starting point in the seas of Japan.
Tonga Tabou is of madreporic formation, with a thick covering of vegetable soil, favourable to an abundant growth of shrubs and trees. The cocoa-tree, the stem of which is slenderer than elsewhere, and the banana-tree here shoot up with wonderful rapidity and vigour.
The soil was almost entirely madreporic, but certain dry stream beds were strewn with granite rubble, proving that this island was of primordial origin. The entire horizon was hidden behind a curtain of wonderful forests. Enormous trees, sometimes as high as 200 feet, were linked to each other by garlands of tropical creepers, genuine natural hammocks that swayed in a mild breeze.
Sailors' luck led the Nautilus straight to Reao Island, one of the most unusual in this group, which was discovered in 1822 by Captain Bell aboard the Minerva. So I was able to study the madreporic process that has created the islands in this ocean.
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