Diphenylamine blue, 101 Distillation, fractional, 78 Doebner, malachite green, 102 Dover, coal under, 60 Dumas and Laurent, anthracene, 171 Dundonald, Earl, early experiments, 39 Eikonogen, 189 Electricity as an illuminating agent, 62 Eocene coal, 12 Eosin, 147 Erythrosin, 188 Essence of mirbane, 74 Exalgine, 179 Fahlberg, saccharin, 186 Faraday, discovers benzene, 73 Fast red, 151 Fertilization by ammonia, 66 Fire-damp, 32 First runnings, 80 Fischer, E. and O., rosaniline, 97 Fischer, hydrazines, 183 Fischer, malachite green, 103 Flavaniline, 180 Flavopurpurin, 174 Fluorescein, 147 Foot-pound, 19 Fractional distillation, 78 Fritzsche, aniline, 75 Gallein, 146 Gallic acid, 146 Gallocyanin, 162 Gambines, 161 Garancin, 168 Garden, naphthalene, 139 Gas producers, 57 Gas, quantity obtained from coal, 45 Girard and De Laire, rosaniline blues, 92 Glucosides, 169 Goethe, visit to coke-burner, 48 Graebe and Liebermann, alizarin, 170 Graphite, 12 Graessler, acid yellow, 120 Green, A. G., primuline, 160 Griess, diazo-compounds, 116 Hales, Rev. Stephen, distils coal, 37 Hofmann, benzene in tar-oil, 73 Hofmann, red from aniline, 89 Hofmann's violets, 93 Homologous series, 152 Horse-power, 22 Hull, Prof., coal supply, 59 Hydrazines, 183 Hydrocarbons of benzene series, 82 Hydrogen, calorific value, 25 Hydroquinone, 189 Hypnone, 179 Indigo plants, 124 Indigo, syntheses, 126 Indophenol, 162 Indulines, 121 Ingrain colours, 160 Iodine green, 94 Iron smelting, 16 Iron swarf, 87 Isochromatic plates, 188 Isomerism, 88 Joule, mechanical equivalent of heat, 19 Juglone, 186 Jurassic coal, 12 Kairine, 182 Kekule, benzene theory, 196 Kekule and Hidegh, azo-dyes, 135 Koch, tubercle, 193 Koechlin, gallocyanin, 162 Koechlin and Witt, indophenol, 162 Kolbe, salicylic acid, 134 Kolbe and Schmitt, phenol dye, 132 Kyanol, 75 Lampblack, 139, 166 Laurent, phenol, 131 Laurent, phthalic acid, 143 Laurent, picric acid, 136 Lauth, methyl violet, 98 Lauth's violet, 111 Leonhardt & Co., stilbene dyes, 137 Lightfoot, aniline black, 114 Light oil, 80 Light oils, early uses, 71 Lister, antiseptic surgery, 131 London, coal introduced, 58 London, illuminated by gas, 40 Lucigen burner, 163 Madder, 168 Magdala red, 149 Magenta, history, 89 Malachite green, 102 Manchester brown, 116 Manchester yellow, 142 Mansfield, isolation of benzene, 73 Mansfield's still, 77 Manures, 66 Marsh gas, 32 Mauve, discovery, 74 Mechanical value of coal, 22 Medlock, magenta process, 90 Methyl chloride, 99 Methylene green, 113 Methyl green, 101 Methyl violet, 98 Mirbane, essence, 74 Murdoch, introduces coal-gas, 40 Naphthalene, annual production, 141