machine generally used, 290. ——­ battery generally used, 291. ——­ and chemical forces identical, 877, 917, 947, 960, 965, 1031. Electricities, their identity, however excited, 265, 360. ——­, one or two, 516, 1667. ——­, two, 1163. ——­, ——­, their independent existence, 1168. ——­, ——­, their inseparability, 1168, 1177, 1244. ——­, ——­, never separated in the current, 1628. Electricity, quantity of, in matter, 852, 861. ——­, its distribution on conductors, 1368. ——­, ——­ influenced by form, 1302, 1374. ——­, ——­ ——­ distance, 1303, 1364, 1371. ——­, ——­ ——­ air’s pressure, 1375. ——­, relation of a vacuum to, 1613. ——­, dissimulated, 1684. ——­, common and voltaic, measured, 361, 860. ——­, its definite decomposing action, 329, 377, 783, 1621. ——­, ——­ heating action, 1625. ——­, ——­ magnetic action, 216, 366. ——­, animal, its characters, 351. ——­, magneto-, its characters, 343. ——­, ordinary, its characters, 284. ——­, thermo-, its characters, 349. ——­, voltaic, its characters, 268. Electricity from magnetism, 27, 36, 57, 83, 135, 140. ——­, on magnetisation of soft iron by currents, 27, 34, 57, 113. ——­ ——­ magnets, 36, 44. ——­, employing permanent magnets, 39, 84, 112. ——­, ——­ terrestrial magnetic force, 140, 150, 161. ——­, ——­ moving conductors, 55, 83, 132, 139, 149, 161, 171. ——­, ——­ ——­ essential condition, 217. ——­ by revolving plate, 83, 149, 240. ——­ ——­ a constant source of electricity, 89, 90, 154. ——­ ——­, law of evolution, 114. ——­ ——­, direction of the current evolved, 91, 99, 110, 116, 117. ——­ ——­, course of the currents in the plate, 123, 150. ——­ by a revolving globe, 137, 160. ——­ by plates, 94, 101. ——­ by a wire, 49, 55, 109, 112, 137. ——­, conductors and magnet may move together, 218. ——­, current produced in a single wire, 49, 55, 170. ——­, ——­ a ready source of electricity, 46, note. ——­, ——­ momentary, 28, 30, 47. ——­, ——­ permanent, 89, 154. ——­, ——­ deflects galvanometer, 30, 39, 46. ——­, ——­ makes magnets, 34. ——­, ——­, shock of, 56. ——­, ——­, spark of, 32. ——­, ——­ traverses fluids, 23, 33. ——­, ——­, its direction, 30, 38, 41, 52, 53, 54, 78, 91, 99, 114, 142,
  166, 220, 222.
——­, effect of approximation and recession, 18, 39, 50. ——­, the essential condition, 217. ——­, general expression of the effects, 256. ——­, from magnets alone, 220. Electricity of the voltaic pile, 875. ——­ its source, 875. ——­ ——­ not metallic contact, 887, 915. ——­ ——­ is in chemical action, 879, 916, 919, 1738, 1741. Electro-chemical decomposition, 450, 661. ——­, nomenclature, 661. ——­, general conditions of, 669. ——­, new conditions of, 453, ——­, influence of water in, 472. ——­, primary and secondary results, 742. ——­, definite, 732, 783. ——­, theory of, 477. ——. See also Decomposition, electrochemical. Electro-chemical equivalents, 824, 833, 835, 855. ——­, table of, 847. ——­, how ascertained, 837. ——­ always consistent, 835.