Naphthalene in carbolic oil, 130 Naphthionic acid, 151 Naphthol green, 161 Naphthol orange, 151 Naphthols, 141 Naphthylamines, 142 Natanson, aniline red, 89 Neutral red, 111 Neutral violet, 111 New blue, 161 Nicholson blue, 93 Nicholson, magenta process, 90 Nietzki, azines, 109 Nietzki, Biebrich scarlet, 156 Nietzki, quinone, 191 Night blue, 106 Nigrosine, 121 Nitrification, 66 Nitrobenzene process, 91 Nitrosodimethylaniline, 111 Non-Carboniferous coal, 11 Number of compounds in tar, 81 Old Red Sandstone, coal in, 12 Oligocene brown coal, 12 Orthochromatic plates, 188 Oxazines, 162 Oxide of iron for gas purifying, 44 Paraffin oil and wax, 50 Patent fuel, 178 Perfumes, 185 Perkin, alizarin, 170 Perkin, discovers mauve, 74 Permanence of dyes, 198 Permian coal, 12 Persoz, phenol dye, 132 Pharmaceutical preparations, 178 Phenanthrene, 172 Phenols, 129 Phosgene dyes, 106 Phosphine, 94, 180 Photographic developers, 189 Phthaleins, 146 Phthalic acid, 143 Picric acid, 136 Pitch, 81, 176 Plants, growth of, 26 Ponceaux, 151 Primary azo-dyes, 156 Primuline, 160 Propiolic acid, 128 Purpurin, 169 Pyrazole, 183 Pyridine, 87 Pyridine bases, 179 Pyrogallol, 146 Quinaldine, 182 Quinic acid, 189 Quinoline, 180 Quinoline green, 182 Quinoline red, 188 Quinoline yellow, 182 Quinones, 172 Read Holliday's lamp, 72 Rectification of hydrocarbons, 84 Resorcinol, 145 Rhodamines, 148 Roccellin, 151 Roman coal-mining, 57 Rosaniline blues, 92 Rosaniline from rosolic acid, 133 Rosolic acid, 132 Runge, kyanol, 75 Runge, phenol in tar, 131 Saccharin, 186 Saffranine, 108 Salicylic acid, 134 Salicylic aldehyde, 185 Salols, 179 Schiendl, Magdala red, 149 Scotland, shale-oil industry, 53 Sea coal, 58 Secondary azo-dyes, 156 Shale, nature of, 51 Shale-oil industry, 50 Skraup, quinoline, 181 Sodium nitrite, 119 Solar energy, 28 Soluble blue, 93 Solvent naphtha, 86 Steam-engines, 20 Stilbene azo-dyes, 137 Structure of coal, 15 Sulphanilic acid, 150 Sulphuric acid, 45 Sunlight, source of energy in coal, 30 Surgery, antiseptic, 131 Tar distilling, 77 Tar, first utilization, 69 Tar from coke-ovens, 49 Tar, quantity obtained from coal, 45 Tartrazine, 184 Tertiary coal, 12 Thalline, 182 Thermifugine, 182 Thiazines, 113 Thiodiphenylamine, 113 Thiorubin, 160 Timber pickling, 70 Tolidine, 136 Toluene from tar, 81 Torbane Hill coal, 52 Transformation of wood into coal, 31 Triassic coal, 12 Trimethylamine, 99 Trinitrophenol, 136 Triphenylmethane, 97 Tubercle bacillus, 193 Turkey red, 170 Underclay, 13 Unverdorben, crystallin, 75 Uses of coal, 16 Vanillin, 185 Vegetable deposits, recent, 13 Verguin, red from aniline, 90