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