Some idea of the extent and importance of the iron trade may be conceived from the following account, abridged from Malkin’s Scenery, &c, of South Wales. “Merthyr Tydvill was a very inconsiderable village till the year 1755, when the late Mr. Bacon obtained a lease of the iron and coal-mines of a district at least eight miles long, and four wide, for 99 years. Since then these mines have been leased by him to four distinct companies, and produce to the heirs of Mr. Bacon a clear annual income of ten thousand pounds. The part occupied by Mr. Crawshay contains now the largest set of iron works in the kingdom. He constantly employs more than two thousand workmen, and pays weekly for wages, coal, and other expenses of the works, twenty-five thousand pounds. The number of smelting furnaces belonging to the different companies at Merthyr is about sixteen. Around each of these furnaces are erected forges and rolling-mills, for converting pig into plate and bar-iron. These works have conferred so much importance on the neighborhood, that the obscure village of Merthyr Tydvill has become the largest town in Wales, and contains more than twelve thousand inhabitants.” _Tin_ is white, a little elastic, and so exceedingly soft and ductile, that it may be beaten out into leaves thinner than paper. It is much more combustible than many of the metals; and is soluble in all the mineral acids. Its specific gravity is 7.291, or about 516 pounds to the cubic foot. This metal is found in Germany, Saxony, South America, the East Indies, and in England, chiefly in Cornwall and Devonshire. It must have been known very early, as it is mentioned in the books of Moses. Homer in his Iliad mentions the use of tin. Pliny says, that the Romans learned the method of tinning their culinary vessels from the Gauls. They used tin to alloy copper, for making those elastic plates which they employ in shooting darts from their warlike machines. The addition of tin to copper renders that metal more fluid, and disposes it to assume all the impressions of the mould. It was probably with a view to this, that it was used by the ancient Romans in their coinage. Many of the imperial _large brass_, as they are called, are found to consist of copper and tin alone. Antique coins frequently occur, made by forgers in the different reigns, in imitation of the silver currency, which contain a very large proportion of tin. There are coins of Nero which are of a most debased and brittle brass.