Olefiant gas, interference of, 610, 652. Ordinary electricity, its tension, 285. ——­ evolution of heat, 287. ——­ magnetic force, 288, 362. ——­ chemical force, 309, 454. ——­ ——­, precautions, 322. ——­ spark, 333. ——­ physiological effect, 332. ——­ general characters considered, 284. ——­, identity with other electricities, 360.  Origin of the force of the voltaic pile, 878, 910, 919.  Oxidation the origin of the electric current in the voltaic pile, 919, 930.  Oxide of lead electrolysed, 797. Oxygen, brush in, 1457. ——­, positive and negative brush in, 1476, ——­, ——­ discharge in, 1513. ——­, solubility of, in cases of electrolyzation, 717, 728. ——­, spark in, 1422. ——­ and hydrogen combined by platina plates, 570, 605, 630. ——­ ——­ spongy platina, 609, 636. ——­ ——­ other metals, 608.

Particles, their nascent state, 658. ——­ in air, how charged, 1564. ——­, neighbouring, their relation to each other, 619, 624, 657. ——­, contiguous, active in induction, 1165, 1677. ——­ of a dielectric, their inductive condition, 1369, 1410, 1669. ——­, polarity of, when under induction, 1298, 1676. ——­, how polarised, 1669, 1679. ——­, ——­, in any direction, 1689. ——­, ——­, as wholes or elements, 1699. ——­, ——­, in electrolytes, 1702. ——­, crystalline, 1689. ——­, contiguous, active in electrolysis, 1349, 1702. ——­, their action in electrolyzation, 520, 1343, 1703. ——­, ——­ local chemical action, 961, 1739. ——­, ——­ relation to electric action, 73. ——­, ——­ electric action, 1669, 1679, 1740.  Path of the electric spark, 1107.  Phosphoric acid not an electrolyte, 682. Physiological effects of voltaic-electricity, 279. ——­ common electricity, 332. ——­ magneto-electricity, 56, 347. ——­ thermo-electricity, 349. ——­ animal electricity, 357. Pile, voltaic, electricity of, 875. ——. See Battery, voltaic. Plates of platina effect combination, 568, 571, 590, 630. ——­ prepared by electricity, 570, 585, 588. ——­ ——­ friction, 591. ——­ ——­ heat, 595. ——­ ——­ chemical cleansing, 599, 605, ——­, clean, their general properties, 633, 717. ——­, their power preserved, 576. ——­, ——­ in water, 580. ——­, their power diminished by action, 581. ——­, ——­ exposure to air, 636. ——­, their power affected by washing in water, 582. ——­, ——­ heat, 584, 597. ——­, ——­ presence of certain gases, 638, 655. ——­, their power, cause of, 590, 616, 630. ——­, theory of their action, Doebereiner’s, 610. ——­, ——­, Dulong and Thenard’s, 611. ——­, ——­, Fusinieri’s, 613. ——­, ——­, author’s, 619, 626, 630, 656. Plates of voltaic battery foul, 1145. ——­, new and old, 1116. ——­, vicinity of, 1148. ——­, immersion of, 1003, 1150. ——­, number of, 989, 1151. ——­, large or small, 1154. Platina, clean, its characters, 633, 717. ——­ attracts matter from the air, 634. ——­, spongy, its state, 637. ——­, clean, its power of effecting combination, 564, 590, 605, 617, 630. ——­, ——­ interfered