An inflammable, fossil substance, of a dry, solid, friable nature, melting with a small proportion of heat;--when fired in the open air, burning almost entirely away with a blue flame and noxious vapor. It is abundantly diffused in many places, especially where metallic minerals are found; but more particularly in those districts where subterranean fires and volcanoes exist. It is also found combined with many different substances. Describe the nature of Sulphur, and the places where it is mostly found. Sulphur almost pure, called native or virgin sulphur, is found in volcanoes and grottoes, in the form of transparent crystals; but the greatest quantity which exists naturally is combined with metals in ores. Sulphur is both fusible and volatile,--which qualities enable us to procure it from those minerals by the process of sublimation: it unites easily, in different degrees, with all metallic matters, excepting gold, platina, and zinc. _Sublimation_, the act of bringing a solid substance into the state of vapor by heat, and condensing it again by cold. Are not its uses very extensive? Yes, both in the arts and in chemistry: it is well known to be a principal ingredient in the preparation of gunpowder and fire-works; it is also used for whitening wool, straw, silk, &c.; many other matters exposed to the vapors of sulphur when burning, quickly lose their color, which no other substance had been able to destroy. Sulphur is also frequently found in mineral waters. Whence are the greatest quantities of Sulphur brought? The largest quantities are brought from Saxony, in irregular masses, which are afterwards melted and cast into small rolls. There are about four species of sulphur; namely, the yellow native sulphur, which in its purest state is clear, and of a pale straw color, found in the gold mines of Peru; in Hungary, and some other places: the green native sulphur, which is harder than the other, is found in small crust-like masses; this sort is chiefly confined to Mount Vesuvius: and the grey native sulphur, common in Iceland and many other places. Native sulphur is also found at the coal mines, near Richmond, Virginia; in Connecticut, Pennsylvania, and other parts of the United States. Which is the most rare and beautiful of all the kinds? The red native sulphur; it is mostly of a fine glowing red, very bright and transparent; it is found, like the first-mentioned sort, in the gold mines of Peru. Common sulphur, such as is used in trade and the arts, is of a pale yellow color; and possesses a peculiar and disagreeable smell, particularly when heated or rubbed. This is mostly extracted from the metallic sulphurets, and is commonly called brimstone. It is the sort employed in making matches. Is there not another substance also employed in the manufacture of matches?