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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

Figure stone, description and uses of, 84

Filtering stone, of what made, 233

Fire damp in coal-mines, what it is, how produced, &c., 19, 153

Flint, description and uses of, 53, 54

——, gun-flints, how made, 54

Florence marble, description and use of, 115

Fluat of lime, 119

Fluats, 13

Fluoric acid, what it is, 13

—— ——, how to etch on glass by means of, 120

—— ——, mode of obtaining, 120

Fluor spar, description and properties of, 119

—— ——, how manufactured, and the uses of, 119

Flux, white, of what made, 137

——, black, 137

Freestone, description and uses of, 233

French chalk, description and uses of, 92

Fuller’s earth, description and use of, 87

Fulminating powder, 176

Fulminating silver, extraordinary properties of, 182

Fumigating of rooms, how effected, 133

Fur in tea kettles, how formed there, 114

G.

Galena, what it is, 203

Gangue, in mining, what it is, 4

Garnet, precious, where found, how cut, and value of, 42, 43

–– ——, how set, and uses of, 42

——, common, 43

——, Syrian and pyrope, 43

Gas, what it is, 10

Gas lights, history and uses of, 156

—— ——, how produced, 156

–– ——, how exhibited on a small scale, 156

Gems, engraving, cutting, and value of, 21-23

——, imitations of, 22

Giant’s causeway, account of, 111

——, Florence, 115

——, Cottam, 116

Marcasite. See Pyrites.

Marking ink, for linen, &c. how made and used, 181

Marl, description and uses of, 114

Matrix, 4

Meerschaum, how obtained, prepared, and used, 84

Mercury, the ores of, 173

——, how extracted from the ore, 175

——, properties and uses of, 175, 176

Mercury mines in India, description of, 175

Metals, different states in which they are found, 165

——, how obtained and prepared for use, 165

Meteoric stones, description of, 193

—— ——, extraordinary instances of their falling from the air in 1492, 1672, 1704, 1795, 1814, &c., 195

—— ——, opinions of learned men respecting, 197

—— ——, properties of, 194

Mica, description of, how obtained, and uses of, 81

Mica slate, or micaceous schistus, 227

Millstones. See Burr Stone.

——, Peak, what formed of, 233

——, of granite, 225

Millstone grit, description and uses of, 233

Mineral green, of what made, 141

Mineral oil. See Petroleum.

Minerals, systematic arrangement of, 4

Mineral tar, description and uses of, 148, 149

Minium, how manufactured, and uses of, 206

Mochoa stone, description and use of, 63

—— ——, imitations of, how made, 63

Mona marble. See Serpentine.

Moonstone, description and use of, 70

Mountains, comparative heights of the principal, 237

Muriatic acid, 13

Muriats, 13

Muscovy glass. See Mica.

Music plates, of what made, 217

N.

Naphtha, where found, uses and properties of, 146

Natron, description of, how obtained and uses of, 128

Nephrite. See Jade.

Nickel, description and uses of, 208

——, oxide of, and for what used, 209

Nitrats, 14

Nitrat of silver, uses of, 181

Nitre, description of, how and whence obtained, 136

——, how manufactured, and uses of, 136, 137

Nitric acid. See Aqua fortis.

Nova Mina topaz, 37

207

Woodstone, description and uses of, 51

Writing slates, how made, 78

Y.

Yttria, 16

Z.

Zaffre, what, how made, and uses of, 221

Zinc, whence obtained, and how extracted from the ore, 209

——, uses and properties of, 210

——, oxide of, used as paint, 211

——, white, how prepared, 141

Zircon, 29