Chapter 58

Earth, natural magneto-electric induction in, 181, 190, 192. _Elasticity of_ gases, 626. ---- gaseous particles, 658. _Electric_ brush, 1425. _See_ Brush, electric. ---- condition of particles of matter, 862, 1669. ---- conduction, 1320. _See_ Conduction. ---- _current_ defined, 283, 511. ---- ----, nature of, 511, 1617, 1627. ---- ----. _See_ Current, electric. ---- ----, _induction of_, 6, 232, 241, 1048, 1101. _See_ Induction of electric current. ---- ----, ----, on itself, 1048. ---- discharge, 1319. _See_ Discharge. ---- force, nature of, 1667. _See_ Forces. ---- induction, 1162. _See_ Induction. ---- inductive capacity, 1252. _See_ Specific inductive capacity. ---- polarity, 1685. _See_ Polarity, electric. ---- spark, 1406. _See_ Spark, electric. ---- and magnetic forces, their relation, 118, 1411, 1653, 1658, 1709, 1731. Electrics, charge of, 1171, 1247. _Electrical_ excitation, 1737. _See_ Excitation. ---- 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. ---- same as chemical equivalents, 836, 839. ---- able to determine atomic number, 851. Electro-chemical excitation, 878, 919, 1738. Electrode defined, 662. _Electrodes_ affected by heat, 1637. ----, _varied in_ size, 714, 722. ----, ---- nature, 807. ----. _See_ Poles. Electrolysis, resistance to, 1007. _Electrolyte_ defined, 664. ---- _exciting, solution of_ acid, 881, 925. ---- ---- alkali, 931, 941. ---- _exciting_, water, 944, 945. ---- ---- sulphuretted solution, 943. _Electrolytes_, their necessary constitution, 669, 823, 829, 858, 921, 1347, 1708. ---- consist of single proportionals of elements, 679, 697, 830, 1707. ---- _essential to voltaic pile_, 921. ---- ----, why, 858, 923. ---- conduct and decompose simultaneously, 413. ---- can conduct feeble currents without decomposition, 967. ----, as ordinary conductors, 970, 983, 1344. ----, solid, their insulating and conducting power, 419. ----, real conductive power not affected by dissolved matters, 1356. ----, needful conducting power, 1158. ---- are good conductors when fluid, 394, 823. _Electrolytes non-conductors when solid_ 381, 394. ----, why, 910, 1705. ----, the exception, 1032. _Electrolytes_, their particles polarize as wholes, 1700. ----, polarized light sent across, 951. ----, relation of their moving elements to the passing current, 923, 1704. ----, their resistance to decomposition, 891, 1007, 1705. ----, and metal, their states in the voltaic pile, 946. ----, salts considered as, 698. ----, acids not of this class, 681. _Electrolytic_ action of the current, 478, 518, 1620. ---- conductors, 474. ---- discharge, 1343. _See_ Discharge, electrolytic. ---- induction, 1164, 1343. ---- _intensity_, 911, 966, 983. ---- ---- varies for different bodies, 912, 986, 1354. ---- ---- of chloride of lead, 978. ---- ---- chloride of silver, 979. ---- ---- sulphate of soda, 975. ---- ---- water, 968, 981. ---- ---- its natural relation, 987. _Electrolyzation_, 450, 661, 1164, 1347, 1704. _See_ Decomposition electro-chemical. ---- defined, 664. ---- facilitated, 394, 417, 549, 1355. ---- in a single circuit, 863, 879. ----, intensity needful for, 919, 966, ---- of chloride of silver, 541, 979. ---- sulphate of magnesia, 495. ---- and conduction associated, 413, 676. Electro-magnet, inductive effects in, 1060. Electro-magnetic induction definite, 216, 366. _Electrometer, Coulomb's_, described, 1180. ----, how used, 1183. _Electro-tonic state_, 60, 231, 242, 1114, 1661, 1729. ---- _considered common to all_ metals, 66. ---- ---- conductors, 76. ---- is a state of tension, 71. ---- is dependent on particles, 73. Elementary bodies probably ions, 849. _Elements evolved_ by force of the current, 493, 520, 524. ---- at the poles, why, 535. ---- determined to either pole, 552, 681, 757. ----, transference of, 454, 538. ----, if not combined, do not travel, 544, 546. _Equivalents_, electro-chemical, 824, 833, 855. ----, chemical and electro-chemical, the same, 836, 839. Ether, interference of, 651. _Evolution_ of electricity, 1162, 1737. ---- of one electric force impossible, 1175. ---- of elements at the poles, why, 535. _Excitation_, electrical, 1737. ---- by chemical action, 878, 916, 1739. ---- by friction, 1744. Exclusive induction, 1681.

Flame favours convectivc discharge, 1580. Flowing water, electric currents in, 190. Fluid terminations for convection, 1581. Fluids, their adhesion to metals, 1038. Fluoride of lead, hot, conducts well, 1340. _Force, chemical_, local, 947, 959, 1739. ----, circulating, 917, 947, 996, 1120. _Force_, electric, nature of, 1163, 1667. ----, inductive, of currents, its nature, 60, 1113, 1735. _Forces, electric_, two, 1163. ----, inseparable, 1163, 1177, 1244, 1627. ---- and chemical, are the same, 877, 916. ---- _and magnetic_, relation of, 1411, 1653, 1658, 1709. ---- ----, are they essentially different? 1663, 1731. _Forces, exciting, of voltaic apparatus_, 887, 916. ----, exalted, 905, 994, 1138, 1148. _Forces_, polar, 1665. ---- _of the current_, direct, 1620. ---- ----, lateral or transverse, 1653, 1709. _Form, its influence on_ induction, 1302, 1374. ---- discharge, 1372, 1374. Fox, his terrestrial electric currents, 187. _Friction_ electricity, its characters, 284. ----, excitement by, 1744. Fusion, conduction consequent upon, 394, 402. Fusinieri, on combination effected by platina, 613.

_Galvanometer_, affected by common electricity, 289, 366. ----, a correct measure of electricity, 367, _note_. _Gases_, their elasticity, 626, 657. ----, conducting power, 1336. ----, _insulating power_, 1381, 1507. ----, ---- not alike, 1395, 1508. ----, _specific inductive capacity_, 1283, 1290. ----, ---- alike in all, 1292. ----, specific influence on brush and spark, 1463, 1687. ----, discharge, disruptive, through, 1381. ----, brush in, 1454. ----, spark in, 1421. ----, _positive and negative brushes in_, 1475. ----, ----, their differences, 1476. ----, positive and negative discharge in, 1393, 1506, 1687. ----, solubility of, in cases of electrolyzation, 717, 728. ----, from water, spontaneous recombination of, 566. ----, mixtures of, affected by platina plates, 571. ----, mixed, relation of their particles, 625. _General_ principles of definite electrolytic action, 822. ---- remarks on voltaic batteries, 1031, 1136. ---- _results as to_ conduction, 443. ---- ---- induction, 1295. _Glass_, its conducting power, 1239. ----, its specific inductive capacity, 1271. ----, _its attraction for_ air, 622. ----, ---- water, 1251. _Globe, revolving of Barlow_, effects explained, 137, 160. ----, is magnetic, 164. _Glow_, 1405, 1525. ----, produced, 1527. ----, positive, 1527. ----, negative, 1530. ----, favoured by rarefaction of air, 1529. ----, is a continuous charge of air, 1526, 1537, 1543. ----, occurs in all gases, 1534. ----, accompanied by a wind, 1535. ----, its nature, 1543, ----, discharge, 1526. ----, brush and spark relation of, 1533, 1538, 1539, 1542. Grotthuss' theory of electro-chemical decomposition, 481, 499, 515. _Growth of a_ brush, 1437. ---- spark, 1553.

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, 1227. _induction, specific_, 1167, 1252, 1307. ----, _the problem_ stated, 1252. ----, ---- solved, 1307. ----, _of air_, 1284. ----, ----, invariable, 1287, 1288. ----, _of gases_, 1283, 1290. ----, ---- alike in all, 1292. ----, of shell-lac, 1256, 1269. ----, glass, 1271. ----, sulphur, 1275. ----, spermaceti, 1279. ----, certain fluid insulators, 1280. _Induction of electric currents_, 6, 34, 232, 241, 1048, 1089, 1101, 1660, 1718. ----, on aiming the principal current, 10, 238, 1101. ----, on stopping the principal current, 10, 17, 238, 1087, 1100. ---- by approximation, 18, 236. ---- by increasing distance, 19, 237. ---- _effective through_ conductors, 1719, 1721, 1735. ---- ---- insulators, 1719, 1722, 1735. ---- in different metals, 193, 202, 211, 213. ---- in the moving earth, 181. ---- in flowing water, 190. ---- in revolving plates, 85, 240. ----, _the induced current, its_ direction, 26, 232. ----, ---- duration, 19, 47, 89. ----, ----, traverses fluids, 20, 23. ----, ----, its intensity in different conductors, 183, 193, 201, 211, 213. ----, ----, not obtained by Leyden discharge, 24. ----, Ampère's results, 78, 255, 379, _note_. _Induction of a current on itself_, 1048, 1109. ----, apparatus used, 1052. ----, _in a_ long wire, 1064, 1068, 1092, 1118. ----, ---- doubled wire, 1096. ----, ---- helix, 1053, 1061. ---- in doubled helices, 1096. ---- in an electro-magnet, 1056, 1060. ----, wire and helix compared, 1065. ----, short wire, effects with, 1067. ----, action momentary, 1070, 1091, 1100. ----, causes no permanent change in the current, 1071. ----, not due to momentum, 1077. ----, induced current separated, 1078, 1089. ----, _effect at_ breaking contact, 1060, 1081, 1084, 1087. ----, ---- making contact, 1101, 1106. ----, _effects produced_, shock, 1060, 1064, 1079. ----, ---- spark, 1060, 1064, 1080. ----, ---- chemical decomposition, 1084. ----, ---- ignition of wire, 1081, 1104. ----, cause is in the conductor, 1059, 1070. ----, general principles of the action, 1093, 1107. ----, direction of the forces lateral, 1108. _induction, magnetic_, 255, 1658, 1710. ----, by intermediate particles, 1663, 1710, 1729, 1735. ----, _through_ quiescent bodies, 1712, 1719, 1720, 1735. ----, ---- moving bodies, 1715, 1716, 1719. ---- and magneto-electric, distinguished, 138, 215, 243, 253. _Induction_, magneto-electric, 27, 58, 81, 140, 193, 1709. _See_ Arago's magnetic phenomena. ----, magnelectric, 58. ----, electrolytic, 1164, 1345, 1702, 1740. ----, volta-electric, 26. Inductive capacity, specific, 1167, 1252. _Inductive force of currents_ lateral, 26, 1108. ----, its nature, 1113, 1660, 1663, 1709. _Inductive force, lines of_, 1231, 1297, 1304. ----, often curved, 1219, 1224, 1230. ----, exhibited by the brush, 1449. ----, their lateral relation, 1231, 1297, 1304. ----, their relation to magnetism, 1411, 1658, 1709. Inductometer, differential, 1307, 1317. Inductric surfaces, 1483. Inexhaustible nature of the electric current, 1631. Inseparability of the two electric forces, 1163, 1177, 1244, 1628. Insulating power of different gases, 1388, 1395, 1507. _Insulation_, 1320, 1359, 1361. ----, its nature, 1321. ---- is sustained induction, 1324. ----, degree of induction sustained, 1362. ---- _dependent on the_ dielectrics, 1368. ---- ---- distance in air, 1303, 1364, 1371. ---- ---- density of air, 1365, 1375. ---- ---- induction, 1368. ---- ---- form of conductors, 1302, 1374. ----, as affected by temperature of air, 1367, 1380. ---- _in different gases_, 1381, 1388. ---- ---- differs, 1395. ---- in liquids and solids, 1403. ---- in metals, 1328, 1331, 1332. ---- and conduction not essentially different, 1320, 1326, 1336, 1338, 1561. ----, its relation to induction, 1324, 1362, 1368, 1678. _Insulators_, liquid, good, 1172. ----, solid, good, 1254. ----, the best conduct, 1233, 1241, 1245, 1247, 1254. ---- tested as to conduction, 1255. ---- and conductors, relation of, 1328, 1334, 1338. _Intensity_, its influence in conduction, 419. ----, inductive, how represented, 1370. ----, relative, of magneto-electric currents, 183, 193, 211, 213. ---- of disruptive discharge constant, 1410. ----, electrolytic, 912, 966, 983, 1354. ---- necessary for electrolyzation, 911, 966. ---- _of the current of single circles_, 904. ---- ---- increased, 906. ---- of electricity in the voltaic battery, 990, 993. ---- of voltaic current increased, 906, 990. _Interference with combining power of platina_, 638, 655. ---- by olefiant gas, 640. ---- carbonic oxide, 645. ---- sulphuret of carbon, 650. ---- ether, 651. Interpositions, their retarding effects, 1018. _Iodides in_ solution, their electrolysis, 769. ---- fusion, their electrolysis, 802, 813. _Iodide_ of lead, electrolysed, 802, 818. ---- of potassium, test of chemical action, 316. _Ions_, what, 665, 824, 833, 834, 849. ---- not transferable alone, 542, 547, 826. ----, table of, 847. _Iron_, both magnetic and magneto-electric at once, 138, 254. ----, copper and sulphur circles, 943.

Jenkin, his shock by one pair of plates, 1049.

Kemp, his amalgam of zinc, 999. Knight, Dr. Gowin, his magnet, 44.

_Lac_, charge removed from, 1203. ----, induction through, 1255. ----, specific inductive capacity of, 1256, 1269. ----, effects of its conducting power, 1234. ----, its relation to conduction and insulation, 1324. _Lateral_ direction of inductive forces of currents, 26, 1108. ---- forces of the current, 1653, 1709. _Law of_ conduction, new, 380, 394, 410. ---- magneto-electric induction, 114. ---- volta-electric induction, 26. _Lead_, chloride of, electrolysed, 794, 815. ----, fluoride of, conducts well when heated, 1340. ----, iodide of, electrolysed, 802, 818. ----, oxide of, electrolysed, 797. _Leyden jar_, condition of its charge, 1682. ----, its charge, nature of, 1300. ----, its discharge, 1300. ----, its residual charge, 1249. _Light_, polarized, passed across electrolytes, 951. ----, _electric_, 1405, 1445, 1560, _note_. ----, ----, spark, 1406, 1553. ----, ----, brush, 1425, 1444, 1445. ----, ----, glow, 1526. Lightning, 1420, 1404, 1641. _Lines of inductive force_, 1231, 1304, ---- often curved, 1219, 1224, 1230. ----, as shown by the brush, 1449. ----, their lateral relation, 1231, 1297, 1304. ----, their relation to magnetism, 1411, 1658, 1709. Liquefaction, conduction consequent upon, 380, 394, 410. Liquid bodies which are non-conductors, 405. Local chemical affinity, 947, 959, 961, 1739.

_Machine_, electric, evolution of electricity by, 1748. ------, magneto-electric, 135, 154, 158, 1118. _Magnelectric_ induction, 58. ----, collectors or conductors, 86. _Magnesia_, sulphate, decomposed against water, 494, 533. ----, transference of, 495. _Magnet_, a measure of conducting power, 216. ---- _and_ current, their relation remembered, 38, _note_. ---- ---- plate revolved together, 218. ---- ---- cylinder revolved together, 219. ---- revolved alone, 220, 223. ---- and moving conductors, their general relation, 256. ---- made by induced current, 13, 14. ----, electricity from, 36, 220, 223. _Magnetic_ bodies, but few, 255. ----, curves, their inductive relation, 217, 232. ---- _effects of_ voltaic electricity, 277. ---- ---- common electricity, 288, 367. ---- ---- magneto-electricity, 27, 83, 345. ---- ---- thermo-electricity, 349. ---- ---- animal electricity, 354. ---- and electric forces, their relation, 118, 1411, 1653, 1658, 1709, 1731. ---- forces active through intermediate particles, 1663, 1710, 1729, 1735. ---- _forces of the current_, 1653. ---- ---- very constant, 1654. ---- deflection by common electricity, 289, 296. ---- phenomena of Arago explained, 81. ---- induction. _See_ Induction, magnetic. ---- _induction through_ quiescent bodies, 1712, 1719, 1720, 1735. ---- ---- moving bodies, 1715, 1719. ---- and magneto-electric action distinguished, 138, 215, 243, 253. _Magnetism_, electricity evolved by, 27. ----, its relation to the lines of inductive force, 1411, 1658, 1709. ---- bodies classed in relation to, 255. _Magneto-electric currents_, their intensity, 183, 193, 211, 213. ----, their direction, 114, 110. ---- traverse fluids, 33. ---- momentary, 30. ---- permanent, 89. ---- in all conductors, 193, 213. _Magneto-electric induction_, 27, 58. ----, terrestrial, 110, 181. ----, law of, 114. ----. _See_ Arago's magnetic phenomena. _Magneto-electric machines_, 135, 154, 158. ----, inductive effects in their wires, 1118, _Magneto-electricity_, its general characters considered, 343, &c. ---- identical with other electricities, 360. ----, its tension, 343. ----, evolution of heat, 344. ----, magnetic force, 345. ----, chemical force, 346. ----, spark, 348. ----, physiological effects, 347. ----. _See_ Induction, magnetic. _Matter_, atoms of, 869, 1703. ----, new condition of, 60, 231, 242, 1114, 1661, 1729. ----, quantity of electricity in, 852, 861, 873, 1652. ----, absolute charge of, 1169. _Measures of electricity_, galvanometer, 367, _note_. ----, voltameter, 704, 736, 739. ----, metal precipitated, 740, 842. Measure of specific inductive capacity, 1307, 1600. _Measurement of_ common and voltaic electricities, 361, 860, 1652. ---- _electricity_, degree, 736, 738. ---- ---- by voltameter, 704, 736, 739. ---- ---- by galvanometer, 367, _note_. ---- ---- by metal precipitated, 740, 842. Mechanical forces affect chemical affinity, 656. Mercurial terminations for convection, 1581. _Mercury_, periodide of, an exception to the law of conduction? 691, 1341. ----, perchloride of, 692, 1341. _Metallic contact_ not necessary for electrolyzation, 879. ---- not essential to the voltaic current, 879, 887, 915. ---- its use in the pile, 893, 896. Metallic poles, 557. Metal and electrolyte, their state, 946. _Metals_, adhesion of fluids to, 1038. ----, _their power of inducing combination_ 564, 608. ----, ---- interfered with, 638. ----, static induction in, 1329, 1332. ----, different, currents induced in, 193, 211. ----, generally secondary results of electrolysis, 746. ---- transfer chemical force, 918. ----, transference of, 539, 545. ---- insulate in a certain degree, 1328. ----, convective currents in, 1603. ----, but few magnetic, 255. Model of relation of magnetism and electricity, 116. Molecular inductive action, 1164, 1669. _Motion_ essential to magneto-electric induction, 39, 217, 256. ---- across magnetic curves, 217. ---- _of conductor and magnet, relative_, 114. ---- ---- not necessary, 218. Moving magnet is electric, 220. _Muriatic acid gas_, its high insulating power, 1395. ----, brush in, 1462. ----, dark discharge in, 1554. ----, glow in, 1534. ----, positive and negative brush in, 1476. ----, _spark in_, 1422, 1463. ----, ----, has no dark interval, 1463, 1555. _Muriatic acid_ decomposed by common electricity, 314. ----, its electrolysis (primary), 758, 786.