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

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