Electron, 287. Electroplating, 213. Electrophorus, the, 11. Electrotyping, 213. Faraday, 66. Finsen light treatment, 243. Franklin, Benjamin, 19. Frictional electricity, 2. Furnace, electric, 111. Galvani, 27. Galvanometer, 59. Glass, 4. Goldschmidt system, 197. _Great Eastern_, the, 148. Half-watt lamp, 105. Heating by electricity, 109. Hughes printing telegraph, 136. Iceberg detector, 267. Ignition, electric, 253. Incandescent lamps, 103. Induction, 9. Induction coil, 61. Ion, 291. Kelvin, Lord, 152. Korn’s photo-telegraph, 174. Lamps, electric, 93. Leclanché cell, 32, 116. Lemström’s experiments in electro-culture, 258. Lepel system, 196. Leyden jar, 15, 181. Light, 23. Lighting, electric, 75, 93. Lightning, 1, 19, 23. Lightning conductors, 25. Lindsay, wireless experiments, 180. Lodge, Sir Oliver, 260. Machines for producing static electricity, 9. Magnetic poles, 50. Magnetism, 44, 56, 291. Marconi, 186, 195. Medicine, electricity in, 241. Mercury-vapour lamp, 99. Microphone, 159. Mines, submarine, 283. Mines, telephones in, 169. Mono-railway, 89. Morse, telegraph, 130; experiments in wireless telegraphy, 180. Motor, electric, 66. Motor-car, electric, 91. Navy, use of wireless, 274; of electricity, 282. Negative electricity, 5. Neon lamps, 102. Non-conductors, 6. Ohm, 33. Oil radiator, 110. Ozone, 23, 247. Ozone ventilation, 249. Petrol, motor, ignition in, 253. Photographophone, the, 173. Pile, voltaic, 28. Pipe locator, 266. Plant culture, electric, 258. Polarization, 31. Pollak-Virag telegraph, 137. Positive electricity, 5. Poulsen, Waldemar, 171, 197. Poultry, electro-culture of, 264. Power stations, 75. Preece, wireless experiments, 180. Primary and secondary coils, 62. Radiator, 109. Railways, electric, 87; use of wireless, 211. Resistance, 33. Röntgen rays, 228, 242. Searchlights, 98. Ships, use of wireless, 206. Siphon recorder, the, 252. Sparking plug, 154. Static electricity, 7. Stations, wireless, 204. Steinheil telegraph, 130. Submarine telegraphy, 144. Submarine telephony, 169. Surface contact system, 83. Telefunken system, 196. Telegraph, the, 128, 144, 171, 179, 203. Telegraphone, 171. Telephone, the, 154, 171, 179, 201. Telephone exchange, 160. Thermopile, 36. Thermostat, 121. Thunderstorms, 22, 194. Trains, electric, 87; the Bachelet, 271. Tramways, electric, 78, 83. Trolley system, 83. Tubes for X-rays, 233. Tuning in wireless telegraphy, 191. Tungsten lamps, 104. Volt, 33. Voltaic electricity, 28, 129, 290. War, electricity in, 274; telegraph in, 277. Water, electrolysis of, 38. Water-power, 81. Waves, electric, 181, 191, 199. Welding, electric, 114. Welsbach lamp, 103.