F Felspars, [62] Ferrous acetate, [74] —— sulphate, [25] Flint, [61] Fluorspar, [48] Formic acid, [78] Fur in kettles, [54]

G Garnet, [63] Gas, laughing, [99] —— lime, [12] —— liquor, [98] Gay Lussac tower, [16] Glass, [64] ——, annealing of, [65] ——, Bohemian, [63] ——, etching on, [47] ——, flint, [63] ——, lead, [63] ——, soda, [63] ——, water, [66] Glauber’s salt, [10] Glover tower, [17] Glue, [56] Graphite, [108] Greek fire, [32] Guncotton, [34] Gunpowder, [32] Gypsum, [27]

H Haber process, [100] Halogen, [43] Hardness, permanent, [53] ——, temporary, [53] Hartshorn, salt of, [99] ——, spirits of, [97] Hornblende, [63] Hydriodic acid, [48] Hydrobromic acid, [48] Hydrochloric acid, [43] Hydrofluoric acid, [47]

I Iceland spar, [50] Ions, [103] Iron pyrites, [11]

J Jade, [63] Jasper, [61]

K Key industries, [10]

L Lake, [26] Lead acetate, [75] —— chambers, [17] —— chamber process, [14] ——, sugar of, [75] —— sulphate, [27] ——, white, [75] Leblanc soda process, [82] Leguminosae, [37] Lemon, salts of, [77] Lime burning, [51] ——, caustic, [97] —— kiln, [51] Limestone, [50] Litmus, [2] Lupin root, [37]

M Marble, [50] Marking ink, [28] Meerschaum, [63] Mica, [63] Mordants, [26] Mycoderma aceti, [68]

N Neutralization, example of, [4] ——, explanation of, [3] Niagara, [101] Nitre, [29] —— pots, [14] Nitric acid, [30] —— ——, from air, [40] —— ——, importance of, [28] —— —— manufacture of, [30] —— ——, properties, [31] —— ——, red fuming, [31] —— oxide, [16] Nitrogen cycle, [37] ——, fixation of, [100] —— peroxide, [16] Nitroglycerine, [34]

O Olein, [78] Onyx, [61] Opal, [61] Orthoclase, [62] Oxalic acid, [77]