[Footnote 1: The barrier known as Adam's Bridge, which obstructs the navigation of the channel between Ceylon and Ramnad, consists of several parallel ledges of conglomerate and sandstone, hard at the surface, and growing coarse and soft as it descends till it rests on a bank of sand, apparently accumulated by the influence of the currents at the change of the monsoons. See an _Essay_ by Captain STEWART _on the Paumbem Passage_. Colombo, 1837. See Vol. II. p. 554.] On the north-west side of the island, where the currents are checked by the obstruction of Adam's Bridge, and still water prevails in the Gulf of Manaar, these deposits have been profusely heaped, and the low sandy plains have been proportionally extended; whilst on the south and east, where the current sweeps unimpeded along the coast, the line of the shore is bold and occasionally rocky. This explanation of the accretion and rising of the land is somewhat opposed to the popular belief that Ceylon was torn from the main land of India[1] by a convulsion, during which the Gulf of Manaar and the narrow channel at Paumbam were formed by the submersion of the adjacent land. The two theories might be reconciled by supposing the sinking to have occurred at an early period, and to have been followed by the uprising still in progress. But on a closer examination of the structure and direction of the mountain system of Ceylon, it exhibits no traces of submersion. It seems erroneous to regard it as a prolongation of the Indian chains; it lies far to the east of the line formed by the Ghauts on either side of the peninsula, and any affinity which it exhibits is rather with the equatorial direction of the intersecting ranges of the Nilgherries and the Vindhya. In their geological elements there is, doubtless, a similarity between the southern extremity of India and the elevated portions of Ceylon; but there are also many important particulars in which their specific differences are irreconcilable with the conjecture of previous continuity. In the north of Ceylon there is a marked preponderance of aqueous strata, which are comparatively rare in the vicinity of Cape Comorin; and whilst the rocks of the former are entirely destitute of organic remains[2]; fossils, both terrestrial and pelagic, have been found in the Eastern Ghauts, and sandstone, in some instances, overlays the primary rocks which compose them. The rich and black soil to the south of the Nilgherries presents a strong contrast to the red and sandy earth of the opposite coast; and both in the flora and fauna of the island there are exceptional peculiarities which suggest a distinction between it and the Indian continent. [Footnote 1: LASSEN, _Indische Alterthumskunde_, vol. i. p. 193.]