lizarin orange, 174

Alkali blue, 93

Amidodimethylaniline, 112

Ammonia in gas-liquor, 64

Ammonia, origin in gas-liquor, 65

Analyses of coal, 23

Aniline black, 114

Aniline, history, 75

Aniline, manufacture, 87

Aniline yellow, 116

Annual production of ammonia, 68

Anthracene, 171

Anthracene brown, 174

Anthracene oil, 81, 167

Anthragallol, 174

Anthrapurpurin, 174

Anthraquinone, 173

Antifebrine, 179

Antipyrine, 183

Archil substitute, 151

Arctic coal, 12

Arsenic acid process, 90

Arsenic acid, recovery, 94

Artificial alizarin, 173

Artificial purpurin, 173

Asphalte, 176

Auramine, 106

Aurin, 132

Azines, 109

Azo-blacks, 159

Azo-colours, 118

Azo-dyes for cotton, 158

Azobenzene, 119

Azo-dyes from salicylic acid, 135

Azotoluene, 119

Baeyer, A. v., indigo, 127

Baeyer, A. v., phthaleins, 146

Basle blue, 111

Becher, early experiments, 34

Beet-sugar cultivation, 67

Benzal chloride, 102

Benzaldehyde, 103

Benzene, discovery, 73

Benzene, final purification, 86

Benzene in tar-oil, 73

Benzene theory, 196

Benzidam, 75

Benzidine, 136

Benzoic acid, manufacture, 104

Benzotrichloride, 102

Benzyl chloride, 102

Bernthsen, methylene blue, 113

Bethell, timber preserving, 70

Biebrich scarlet, 156

Biology, dyes used in, 192

Bismarck brown, 116

Bitter-almond oil, 103

Bone oil, 180

Boettiger, Congo-red, 157

Breant, timber pickling, 70

Briquettes, 178

Burning naphtha, 86

Calorific value of carbon, 25

Calorific value of coal, 20

Carbolic acid, 129

Carbolic oil, 23, 80, 129

Carbon dioxide, 24

Carboniferous period, 11

Caro and Kern, phosgene dyes, 106

Caro and Wanklyn, rosolic acid, 133

Caro, fluorescein and eosin, 147

Caro, methylene blue, 112

Chemical washing, 83

Chlorophyll, 29

Chrysamines, 136

Chrysoidine, 116

Cinnamic acid, 128

Clayton, Dean, distils coal, 35

Clegg, Samuel, gas-engineer, 40

Coal, amount raised, 59

Coal-fields of United Kingdom, 60

Coal-gas, composition, 56

Coal-gas, manufacture, 42

Coal-mining, history, 57

Coal, origin, 9

Coal, supply, 59

Coerulein, 147

Coke, composition of, 48

Coke from gas-retorts, 45

Coke-oven tar, 49

Coke, u