Hachette’s view of electro-chemical decomposition, 491.  Hare’s voltaic trough, 1123, 1132.  Harris on induction in air, 1363. Heat affects the two electrodes, 1637. ——­ increases the conducting power of some bodies, 432, 438, 1340. ——­, its conduction related to that of electricity, 416. ——­, as a result of the electric current, 853, note, 1625, 1630. ——­ evolved by animal electricity, 353. ——­ ——­ common electricity, 287. ——­ ——­ magneto-electricity, 344. ——­ ——­ thermo-electricity, 349. ——­ ——­ voltaic electricity, 276.  Helix, inductive effects in, 1061, 1094.  Hydriodic acid, its electrolyses, 767, 787.  Hydrocyanic acid, its electrolyses, 771, 788.  Hydrofluoric acid, not electrolysable, 770. Hydrogen, brush in, 1459. ——­, positive and negative brush in, 1476. ——­, ——­ discharge in, 1514. Hydrogen and oxygen combined by platina plates, 570, 605. ——­ spongy platina, 609.

Ice, its conducting power, 419. ——­ a non-conductor of voltaic currents, 381.  Iceland crystal, induction across, 1695. Identity, of electricities, 265, 360. ——­ of chemical and electrical forces, 877, 917, 947, 961, 1031.  Ignition of wire by electric current, 853, note, 1630.  Improved voltaic battery, 1006, 1120.  Increase of cells in voltaic battery, effect of, 990.  Inducteous surfaces, 1483. Induction apparatus, 1187. ——­, fixing the stem, 1190, 1193, 1200. ——­, precautions, 1194, 1199, 1213, 1232, 1250. ——­, removal of charge, 1203. ——­, retention of charge, 1205, 1207. ——­, a charge divided, 1208. ——­, peculiar effects with, 1233. Induction, static, 1161. ——­, an action of contiguous particles, 1165, 1231, 1253, 1295, 1450,
  1668, 1679.
——­, consists in a polarity of particles, 1298, 1670, 1679. ——­, continues only in insulators, 1298, 1324, 1338. ——­, intensity of, sustained, 1362. ——­, influenced by the form of conductors, 1302. ——­, ——­ distance of conductors, 1303. ——­, ——­ relation of the bounding surfaces, 1483. ——­, charge, a case of, 1171, 1177, 1300. ——­, exclusive action, 1681. ——­, towards space, 1614. ——­, across a vacuum, 1614. ——­ through air, 1217, 1284. ——­ ——­ different gases, 1381, 1395. ——­ ——­ crystals, 1689, ——­ ——­ lac, 1228, 1255, 1308. ——­ ——­ metals, 1329, 1332. ——­ ——­ all bodies, 1331, 1334. ——­, its relation to other electrical actions, 1165, 1178. ——­, ——­ insulation, 1324, 13602, 1368, 1678. ——­, ——­ conduction, 1320. ——­, ——­ discharge, 1319, 1323, 1362. ——­, ——­ electrolyzation, 1164, 1343. ——­, ——­ intensity, 1178, 1362. ——­, ——­ excitation, 1178, 1740. ——­, its relation to charge, 1177, 1299. ——­ an essential general electric function, 1178, 1299. ——­, general results as to, 1295. ——­, theory of, 1165, 1231, 1295, 1667, 1669. ——­ in curved lines, 1166, 1215, 1679. ——­ ——­, through air, 1218, 1449. ——­ ——­, ——­ other gases, 1226. ——­ ——­, ——­ lac, 1228. ——­ ——­, ——­ sulphur, 1228. ——­ ——­, ——­ oil of turpentine,