_Antimony_ is of a dusky white color, brilliant, brittle, and destitute of ductility. Though seemingly hard, it may be cut with a knife. Its specific gravity, according to Bergman, is 6.86. It is procured from an ore which is found chiefly in Hungary and Norway. Native antimony, alloyed with a small portion of silver and iron, has been found in Sweden. And it is said, that it has been found in the state of Connecticut, in America, nearly in a pure metallic form. There are five distinct ores of antimony, but the grey is the only one found in sufficient quantity for the manufacturer; it is a sulphuret of antimony. Perhaps we have no metal more valuable as a medicine than this, or one which is applied in such various ways. _Bismuth_ is of a yellowish white color, lamellated texture, and moderately hard, but not malleable. It is so brittle that it breaks readily under the hammer, and may be reduced to powder. It has the singular property of _expanding_ as it cools. Hence, probably, its use in the metallic composition for printers’ types; as from this expansive property are obtained the most perfect impressions of the moulds in which the letters are cast. In manufactories this metal is known to the workmen by the name of _tin glass_. It is one of the metals which will inflame when suspended in oxymuriatic acid gas. It is generally found with cobalt in the cobaltic ores of Saxony and England. Native bismuth, and sulphuret of bismuth, are found on the continent; and a sulphuret of bismuth has been discovered in Cornwall; but this is not an abundant metal. If 8 parts of bismuth, 5 of lead, and 3 of tin, be melted together, the mixed metal will fuse at a heat no greater than 212°. Tea-spoons made of this alloy are sold in London, to surprise those who are unacquainted with their nature. They have the appearance of common tea-spoons, but melt as soon as they are put into hot tea. _Arsenic_, when reduced to its pure metallic state, is a friable brilliant metal, of a blueish white color, easily tarnishing, or oxidizing, by exposure to the air. In all its states it is extremely poisonous. It may be known by the smell of garlic, and by the white fumes which it exhales when thrown upon a piece of red-hot coal. Its specific gravity is 8.310. It is found in Bohemia, Hungary, Saxony, and other places on the continent; and in combination with acids, sulphur, or oxygen. The arsenic of commerce is prepared in Saxony, in the operation of roasting the cobalt ores for the manufacture of zaffre. The reverberatory furnace in which the ores are roasted terminates in a long horizontal chimney; and in this chimney the arsenical vapors are condensed, forming a crust, which at stated times is cleared off by criminals, who are condemned to this work.