one of the four imperfect metals.

For an account of its metalline qualities, and the various slates in which it is found, see MINERALOGY, page 118. For its chemical qualities, see the places referred to in CHEMISTRY-INDEX. For the method of effaying and melting its ore, see METALLURGY, Part ii. sect. vi.; Part iii. sect. vi. See also CORNWALL, and PHARMACY-INDEX.—An advantageous commerce has been lately opened between Cornwall and the East Indies and China. In 1791 about 3000 tons of tin were raised in Cornwall; of which 2200 tons were sold in the European market for L.72 each, and 800 tons carried to India and China at L.62 per ton.

INCAL, the name by which crude or impure borax is called. See BORAX and CHEMISTRY-INDEX.