The only Palm found here was that already mentioned, the Caryota mitis, a species not enumerated in Persoon’s Synopsis, nor in the Species Plantarum of Willdenow, for what reason it does not appear. It is very well described by Loureiro; and it appears to be totally different from the Caryota urens.
On the sea-coast there is a species of Pandanus extremely common. It throws up a simple stem to the height of ten feet or more, in which respect only it seems to differ from the Pandanus odoratissimus, the habit of which is to extend along the ground, throwing down straight and stout roots into the earth for its support, as it extends.
The Scævola, already mentioned, is common here as on the Malacca coast.
The form, distribution, and peculiar appearance of the land we had now made were calculated to excite our attention, particularly in relation to the contiguous continent. We were entering amidst innumerable groups of islands, composing for the most part mountain masses, and all of them much elevated. They were as various in form and dimension, as they were numerous and picturesque. They were all covered with vegetation, which, after we had passed their southern boundary, assumed a more luxuriant appearance. They each might be imagined to be the abode of an innocent, a happy, an undisturbed people. Nature, arrayed in her most attractive colours, appeared to smile upon the scene. The sea was calm and unruffled; the sky serene and unclouded. Nothing could be more deceitful than this apparent fitness for the abode of man. There seemed little reason to believe that any of them had ever been occupied. The want of a constant supply of water must ever be a principal objection, while their steep forms and scanty soil forbid every attempt at cultivation. In many, the summits of the islands are rounded, in others peaked and rugged. In fact, we here appear to have ascended the tops of a range of mountains, in structure partaking of the nature of rocks both of the primitive and secondary kind. The direction of this partly submerged range is like that on the peninsula of Malacca, from north to south, bending a little from east to west. The breadth of the range is considerable. The islands form a continuous narrow belt extending along the coast, in this respect somewhat similar to those on the east coast of the bay of Bengal. There, however, we observe a stupendous parallel chain of mountains extending from one extremity of the peninsula to the other; whilst here the most remarkable circumstance was the extreme lowness of the continental land. It is an extensive alluvion on a level with the sea; on which we look in vain for hill or elevation of any sort. At the distance of a few miles, the trees only, and not the ground, are visible from the deck, whilst the islands, many of them rising above 1,000 feet, are to be seen many miles off.
The occurrence of granite on this, the first of the series, was rather unexpected.
This granite presents several varieties. It is less perfectly crystallized, and more granular, than that we found on the west coast of the peninsula of Malacca. Many of the specimens contain hornblende; and on the summit of the hill there is a red granite, which breaks into brick-like fragments. The lower granite is uncommonly hard, and breaks with much difficulty.
March 13th.—We had now got amongst innumerable groups of islands, for the most part of small dimensions, all of them lofty, abrupt on their sides, and almost invariably without any level ground attached. We remarked, however, that in proportion as we advanced towards the north, the vegetation had, as has already been observed, assumed a more luxuriant appearance. Vegetable life again assumed that vigour which had so often already attracted our admiration, and the intertropical forest again displayed its unparalleled riches. This sensible improvement in the forms of vegetation is probably owing to the genial influence of a milder climate, and perhaps still more to the change which has perceptibly taken place in the geological structure of the country. But feeble traces of granite, as rolled masses, were now to be seen. This series of rock had been substituted by various others of later formation.
In the course of the day we visited two of these islands. They were each about a mile in circumference, and from 200 to 300 feet high in the centre; the first lies in lat. 9° 58´ N., and long. 104° 37´ E., about ninety-three miles from Pulo Ubi: the other lies about three miles north of the last. In the first, the lowest rock is composed of compact feldspar, of an iron-brown colour, intersected by narrow seams of quartz. This rock is abundant along the base of the island, near to the sea-mark.
The bulk of the island appears to be composed of a compound rock, formed of clay-stone and potstone intermixed. This rock is rather soft, and its fracture resembles that of some fine grained sandstones. It occurs both on the top and towards the base of the hill.