Part 38

Hemp, 21

Henry, William, 75

Herodotus, 56

Hertz, 68

Hertzian waves, 271

Hewitt, Cooper, produces mercury-arcs, 124, 125

Home: artificial light in relation to, 6; lighting, 325 et seq.

Hindu: light in, ceremonials, 40

Hudson-Fulton Celebration, 306

Huygens, 195

Hydrocarbons, 82

Hydrogen, 81

Illiteracy, artificial light and, 9

Invention, 7, 97

Iowa, 238

Iridium, 129

Iron, 18, 262, 294

Iron pyrites, 18

Italy, 249

Jablochkov: electric candle of, 117

Jamaica, 19

Jandus, 118, 122

Japan: 19; use of oil in, 30; 281

Jerusalem, 43

Jews: artificial light among, 40

Journal, Paris, quoted, 210-212

Kerosene: 57; weight of, lumens, 60; 62, 187, 233

Kitson, platinum-gauze mantle applied by, 61