In 1846-7, we find by the treasury report, that the United States exported of domestic manufactures, 3,197,135 pounds of nails, worth $168,817, of which Cuba took 2,317,550 pounds; also other articles of iron and steel to the value of $998,667, of which $478,681 to Cuba, and $162,020 to British North America. In that year, among the imports, chiefly from England, were 549 tuns of steel, value $1,126,458; 55,599 tuns of bar iron; 28,083 tuns of pig; 1,893 tuns of scraps; 6,167,720 pounds of chain cables; 13,410,556 pounds of sheet and hoop; 1,412,332 pounds of anvils; 921,845 pounds of nails; 361,423 pounds of anchors; 975,256 pounds of castings; 170,909 pounds of cast-iron butts; 431,916 pounds of band; 660,133 pounds of round or square; 347,737 pounds of nail or spike rods. Official tables show that the imports of manufactures of steel and iron in 1839, were worth $6,507,510; in 1843, $1,012,086; in 1844, $3,313,796; in 1845, $5,077,788; and that in 1839, the value of pig and bar iron and steel imported was $6,302,539; in 1842 and 1845, nearly four millions each year; in 1843, $1,091,598; and in 1844, $2,380,027. Some idea of the extent of the iron trade inland may be formed from the quantities carried on the canals. In 1847, there came to the Hudson on the New York canals, pig iron, 21,608,000 pounds; bloom and bar 26,348,000 pounds; iron ware, 3,014,000 pounds: 340 tuns of iron and iron ware were cleared on the canals at Buffalo and Oswego; St. Lawrence county, N. Y., shipped 515 tuns of pig, a surplus made there; 7,716 tuns of pig iron reached Buffalo _via_ Lake Erie, and 1,256 kegs of nails; 15,103,565 pounds of iron and nails arrived at Cleveland _via_ the Ohio canal, and 4,085 tuns of iron and 12,537 kegs of nails were shipped from Cleveland coastwise. There were cleared at Portsmouth, Chilicothe, Massillon, and Akron, in 1847, about 5,713 tuns of iron; 5,269,055 pounds of nails were shipped at Akron. The trade in coal and iron on the western rivers and lakes is very large. Iron canal-boats were in common use in Wales thirty years ago: they are beginning to be made here; also war-steamers. Fences, and even porches to houses, are often of iron. The pipes for the Croton water in New York required many thousand tuns. The annual value of 150,000 tuns of iron ore of Maryland is worth $600,000 at Baltimore. A single foundery in Tennessee sold, in 1844, of sugar-kettles, $50,000 worth.