The constitution of the island is unfavourable to metals. All the examinations hitherto made confirm this assertion, and it may be laid down as a general position, that no metals occur, in such a quantity, or with such richness of ore, as to reward the operations of the miner. The only notice we have of the existence of gold or silver is contained in the first volume of the Transactions of the Batavian Society; and the attempts on the mountain of _Párang_, in 1723, and on the _Mégeméndung_, in 1744, were soon abandoned. Iron pyrites is found in small quantity in several districts, as well as red-ochre; which, however, often contains so little iron, as scarcely to serve for the common purpose of paint. The existence of mercury in the low lands of _Démak_, where it is distributed in minute particles through the clay of the rice-grounds bounding one of the principal rivers of that district, has not been considered as an indication of a mine, or of the ores of that metal. No diamonds are found, nor other precious stones, but many minerals of the schorl, quartz, potstone, feldspar, and trap kind. They mostly exist in mountains of secondary elevation, towards the southern shores of the island, sometimes in extensive veins; but separate fragments are carried down by the rivers, and found far from their original deposition. Prase is found in very extensive veins; hornstone is also abundant in particular situations, as well as flint, chalcedony, hyalite, common jasper, jasper-agate, obsidian, and porphyry. The soil in Java is for the most part rich, and remarkable for its depth; probably owing to the exclusively volcanic constitution of the country, and the constant accession of new mould, which is washed down the side of its numerous mountains. It has the character of being in a high degree richer than the ordinary soil of the Malayan countries in general, particularly of Sumatra and the Malayan peninsula. The best soil resembles the richest garden-mould of Europe; and whenever it can be exposed to the inundation necessary for the rice crop, requires no manure, and will bear without impoverishment, one heavy and one light crop in the year: the poorest, with this advantage, will yield a liberal return to the husbandman. In an island of such extent and variety of surface, the soil is necessarily various, but its general character is that of extraordinary fertility. The red and very light soil of the western districts is generally considered inferior to the dark brown and stiffer soil which prevails in the eastern. The best soil is usually found near the beds of rivers, in the valleys, and on the slopes of the largest mountains: the worst on the ranges of low calcareous hills, which run through different parts of the island.