Part 34

Chemistry: artificial light and, 256-268

Chicago, 62, 304, 305

Chimneys, 54, 60, 62

China, 19, 31, 32

Chlorate of potash, 22

Christ, 33, 46, 47

Christians, "children of light," 42

Christmas trees, 43, 304

Chromium, 294

Church of England, 49

Cities: economy of artificial lighting in congested, 13

Civilization: effect of artificial light upon, 4 et seq.; fire and, 15

Clark, Parker and, 139

Clayton, Dr.: invention of portable gas-light by, 64; quoted, 64, 65; experiments of, with coal-gas, 67

Claude, 147

Cleaves, Dr., quoted, 276, 277

Clegg, Samuel: 74; gas-lighting accomplishments of, 75, 76

Cleveland, 159

"Clouds, The," Aristophanes, 19

Coal: 32; as a light-source, 55; supply, 223; 228

Coal-gas: 63 et seq.; public lighting by, developed, 70 et seq.; analytical production of, 103, 104; yield of, retort (table), 105; analysis of, 106

Coal-mines, 234 et seq.

Cobalt, 294

Coke, 68, 105

Cologne, 157, 158

Colomb, Philip, 197

Color: 9; relation of artificial light to, 284 et seq.

Colza, 31, 52, 167