Amalgams, what they are, 176 Amazon stone, description and use of, 69 Amber, description and history of, 161 ——, where found, and how wrought, 162 ——, uses and properties of, 163 ——, varnish, 163 ——, gum animè often mistaken for, 164 Amethyst, oriental, 32 ——, common, description and uses of, 48 Amianthus. See Asbestos. Ammonia, muriat of. See Sal─ammoniac. Antimony, description of, and whence obtained, 215 ——, how prepared, and uses of, 216, 217 ——, butter and glass of, 217 ——, oxides of, 217 Antimonial powder, of what composed, 217 —— wine, how prepared, and use of, 217 Aqua marine, description, value, and uses of, 39, 40 ——, where found, how cut and set, 40 Aqua fortis, mode of manufacturing, and uses of, 138 Aqua regia, of what made, 139 Argil, 15 Arsenic, description of, and whence obtained, 212 ——, how prepared for use, and the uses of, 213 ——, poisonous effects of, how counteracted, 213 ——, how to know from any other substance, 213 Asbestos, use of, for making incombustible cloth, &c., 93, 94 Asphalt, description of, where found, and uses of, 149, 150 Avanturine, description, uses, and value of, 50 ——, imitations of, how made, 50 Axestone, description and use of, 89 Azure stone, description and uses of, 67, 68 ——, imitation of, how made, 68 B. Barilla. See Soda. Barium, 17 Barytes, description and uses of, 120 ——, sulphat of, 121 Basalt, description and uses of, 95, 96 Bath stone, description and uses of, 114 Bell metal, of what made, 188 Beryl. See Aqua marine:aqua─marine#. Betton’s British oil, what it is, 146 Biscuit porcelain, what it is, and how made, 75 Bismuth, description and uses of, 217, 218 ——, singular fusible metal prepared from, 218 ——, experiment with, illustrative of metallic crystal, 234 Bitumen. See Asphalt, 149 ——, elastic, 149 Black chalk, description and use of, 80 ——, pencils, how made, 80 Black tin, what it is, 200 Bloodstone, description and uses of, 59 ——, singular specimen of, 59 Blue John. See Fluor spar. Blende, 209 Bole, description and uses of, 87 Bologna phosphorus, or Bononian stone, how prepared, and properties of, 121 Boracic acid, 13 Borax, description of, whence and how obtained, 134 ——, preparation and uses of, 135 Bottles, how made, 55 Brass, how made, and uses of, 187 —— wire, properties and uses of, 187 Bricks, how made, 72 Brimstone. See Sulphur. Bristol diamonds, 47 Bronze, how made, and uses of, 187 Burning spring, description of one in Shropshire, 147 Burr─stone, or millstone, description of, 44 ——, where found, uses of, and how split, 45 Buxton diamonds, 47 C. Cachalong opal, description and use of, 65 Calamine, description and uses of, 209─211 Calcareous substances, 17, 97 Calcedony, description and uses of, 56, 57 Calcium, 18 Calomel, how made, and uses of, 177 Caloric, 9 Calp. See Lias. Caoutchouc mineral, 149 Carbon, 20 Carbonats, 13