Carbonic acid, 12 Carbuncle, 43 Carnelian, description, uses, and value of, 57 Cat’s─eye, description of, how cut, and uses of, 50 Cave of Fingal, account of, 96 Cairn gorum crystal, whence obtained, how wrought, and uses of, 49 Ceruse. See White lead. Chalk, description and uses of, 99 ——, black, description and uses of, 80 ——, red, how prepared, and uses of, 199 Chinese grotesque figures, of what made, 84 Choke damp in coal─mines, what it is, how produced, and how to prevent the injurious effects of, 154 Chrysoberyl, description, value, and uses of, 35 Chrysolite, description of, how cut, and uses of, 95 Chrysoprase, description of, how cut, imitations, and uses of, 58, 59 Cinnabar, artificial, how manufactured, and use of, 177 Cinnamon stone, 44 Clay, various kinds, description and uses of, 71, 72 Clay─slate. See Roofing─slate. Coal, description of, where found, and value of, 151 ——, supposed origin, and various uses of, 155 Coal mines, account of, 152 Coal trade, history, &c. of, 154─156 Coal, cannel, what, why so called, and uses of, 157 ——, stone, Kilkenny, or Glance, and Welsh, 158 ——, Bovey, or brown, 158 ——, pitch, 158 ——, parrot, 157 Cobalt, account of, whence obtained, and uses of, 220 ——, oxide of, 221 Coke, uses of, 156 Copper, description and ancient uses of, 183 ——, mines of Anglesea described, 183 ——, how extracted from the ore, &c., 183 ——, uses of, 185, 186 ——, vessels, in what respects pernicious, 185 ——, oxide of, uses of, 186 ——, alloys of, 186 ——, white, of what made, and uses of, 188 ——, how to gild, 172 ——, sulphat of. See Vitriol, white. Copperas. See Vitriol─green. Cornish diamonds, 47 Corrosive sublimate, what it is, and uses of, 177 Corundum, description and uses of, 34 Crystal, description and uses of, 45─47 ——, where found, how wrought and polished, 46, 47 Culm, what it is, and the uses of, 157 D. Derbyshire spar. See Fluor spar. Diachylon plaster, how made, and uses of, 206 Diamond, description of, 23 ——, where found, how obtained, and how known, 23, 24 ——, properties of, 24 ——, how cut, polished, and set, 26 ——, value and uses of, 26, 27 ——, account of several remarkable diamonds, 27, 28, 29 ——, Buxton, Cornish, and Carrara diamonds, 47, 102 Drawing slate. See Black chalk. Dropping well at Knaresborough, 113 Dutch gold, how made, 187 Dykes, mineral, 3 E. Earth, 14 earthenware, how manufactured, 71 Eau─de─luce, of what made, 164 Egyptian pebble, description and uses of, 61 Electron of the ancients, what it was, 162 Emerald, description of, where found, how set, and how valued, 38 ——, oriental, 32 ——, false, 49 Emery, description, properties, and uses of, 33 ——, how prepared for use, 33 ——, red, 43 Epsom salts, description of, how made, and uses of, 126 F. Faults, in mining, what they are, 3 Felspar, common, description and uses of, 69 ——, Labrador, 69