The geographical conditions, and more especially the Tertiary sandstone of which the large area of the islands consists, point to a former connection with Arakan, and, in accordance with these indications, it is found that the bulk of the flora is Burmese; but the forest trees are finer, being very lofty and straight, while not a few purely Malayan species find their northern limit in the Andamans. The flora is not related to that of Hindustan and India proper--a coincidence which can be partly explained by the insular climate and difference of soil. The forests produce valuable woods, which can be used for many trade purposes--furniture; ship, boat and house building; railway carriages and sleepers; paving blocks, boxes, gun-carriages and stocks, pianos, etc.; and as profitable minor products, there are canes for furniture, rattans for walking-sticks, and gurjan oil. Some of the woods can be obtained in extremely large quantities; all possibly in sufficiency for any trade that may arise with the islands. Palms abound; the banian and padouk, that resembles mahogany; marble-wood, of a black, mottled appearance; satin-wood; and the iron tree, which turns the edge of an axe, are all found in the forests, in beautiful confusion with cotton-trees, screw-pines, and arborescent euphorbias, and with large clumps of bamboos, 30 and 40 feet high; while all round the coasts, mangroves, the most satisfactory of firewoods, give shelter to lovely orchids. A very conspicuous feature of the forests is the distribution (apart from the strictly littoral vegetation) into evergreen forest, very full of large gurjan trees (_Dipterocarpeæ_), and a leaf-shedding forest, containing a large proportion of padouk (_Pterocarpus dalbergioides_), or into a mixture of these two types. The great peculiarity of the Andaman flora is that, with the exception of the Cocos Islands, which are covered with them, and thence indeed derive their name, no coconut palms naturally propagated are found in the Archipelago.[86] This is the more strange when it is remembered that all the shores of the Bengal Sea are the home of this tree, and that it simply teems in all the islands of the Nicobar group to the south. During the past thirty-five years advantage has been taken of trips in the Station steamer (or by other means) to plant coconuts at suitable localities[87] along the coasts of Great Andaman, and in recent years at Little Andaman. Great numbers of the nuts were consumed by the aborigines, or by wild pigs, but at several places fruit has been obtainable, for many years past, from trees which escaped destruction.