By the general use of chronometers in latter times the means have been afforded of determining the positions of many prominent points both on the eastern and western coasts, by which the map of the island has been considerably improved: but particular surveys, such as those of the bays and islets from Batang-kapas to Padang, made with great ability by Captain (now Lieutenant-Colonel) John Macdonald; of the coast from Priaman to the islands off Achin by Captain George Robertson; and of Siak River by Mr. Francis Lynch, are much wanted; and the interior of the country is still very imperfectly known. From sketches of the routes of Mr. Charles Campbell and of Lieutenant Hastings Dare I have been enabled to delineate the principal features of the Sarampei, Sungei Tenang and Korinchi countries, inland of Ipu, Moco-moco, and Indrapura; and advantage has been taken of all other information that could be procured. For the general materials from which the map is constructed I am chiefly indebted to the kindness of my friend, the late Mr. Alexander Dalrymple, whose indefatigable labours during a long life have contributed more than those of any other person to the improvement of Indian Hydrography. It may be proper to observe that the map of Sumatra to be found in the fifth volume of Valentyn's great work is so extremely incorrect, even in regard to those parts immediately subject to the Dutch government, as to be quite useless. UNKNOWN TO THE ANCIENTS. TAPROBANE. Notwithstanding the obvious situation of this island in the direct track from the ports of India to the Spice Islands and to China, it seems to have been unknown to the Greek and Roman geographers, whose information or conjectures carried them no farther than Selan-dib or Ceylon, which has claims to be considered as their Taprobane; although during the middle ages that celebrated name was almost uniformly applied to Sumatra. The single circumstance indeed of the latter being intersected by the equator (as Taprobane was said to be) is sufficient to justify the doubts of those who were disinclined to apply it to the former; and whether in fact the obscure and contradictory descriptions given by Strabo, Pomponius Mela, Pliny, and Ptolemy, belonged to any actual place, however imperfectly known; or whether, observing that a number of rare and valuable commodities were brought from an island or islands in the supposed extremity of the East, they might have been led to give place in their charts to one of vast extent, which should stand as the representative of the whole, is a question not to be hastily decided. OPHIR.