ses of, 47

Combustion, 23

Composition of coal, 23

Congo red, 157

Conservation of energy, 18

Constitution of molecules, 95

Corallin, 132

Cotton dyes, 137

Coumarin, 185

Coupier's process, 91

Creosote oil, 163

Creosoting of timber, 70

Cresols, 131

Cresylic acid, 131

Cretaceous coal, 12

Crocein scarlets, 156

Crystal violet, 106

Cumidine, 155

Cyanin, 188

Dale and Caro, induline, 120

Destructive distillation, 33

Diazo-compounds, 116

Diazotype, 191

Dimethylaniline, 100

Dinitrobenzene, 120

Diphenylamine, 101

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