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Contents.
Page
Convection-currents: Rowland's experiments,
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339
The moving charged sphere: researches of J.J. Thomson, FitzGerald, and Heaviside,
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310
Conduction of rapidly-alternating currents,
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344
FitzGerald devises the magnetic radiator,
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345
Poynting's theorem,
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347
Poynting and J.J. Thomson develop the theory of moving lines of force,
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349
Mechanical momentum in the electromagnetic field,
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352
Now derivation of Maxwell's equations by Hertz,
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333
Hertz's assumptions and Weber's theory,
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356
Experiments of Hertz on electric waves,
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357
The memoirs of Hertz and Heaviside on fields in which material bodies are in motion,
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365
The current of dielectric convection,
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367
Kerr's magneto-optic phenomenon,
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368
Rowland's theory of magneto-optics,
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369
The rotation of the plane of polarization in naturally active bodies,
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370

CHAPTER XI.

Conduction in Solutions and Gases, from Faraday to J. J. Thomson.

The hypothesis of Williamson and Clausius,
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372
Migration of the ions,
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373
The researches of Hittorf and Kohlrausch,
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374
Polarization of electrodes,
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375
Electrocapillarity,
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376
Single differences of potential,
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379
Helmholtz' theory of concentration-cells,
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381
Arrhonius' hypothesis,
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383
The researches of Nernst,
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386
Earlier investigations of the discharge in rarefied gases,
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390
Faraday observes the dark space,
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391
Researches of Plücker, Hittorf, Goldstein, and Varley, on the cathode rays,
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393
Crookes and the fourth state of matter,
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394
Objections and alternatives to the charged-particle theory of cathode rays,
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395
Giese's and Schuster's ionic theory of conduction in gases,
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397
J.J. Thomson measures the velocity of cathode rays,
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400