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| CONTENTS. | xxi |
| Art. | Page |
|---|---|
| 788. The specific inductive capacity of a dielectric is the square of its index of refraction | 388 |
| 789. Comparison of these quantities in the case of paraffin | 388 |
| 790. Theory of plane waves | 389 |
| 791. The electric displacement and the magnetic disturbance are in the plane of the wave-front, and perpendicular to each other | 390 |
| 792. Energy and stress during radiation | 391 |
| 793. Pressure exerted by light | 391 |
| 794. Equations of motion in a crystallized medium | 392 |
| 795. Propagation of plane waves | 393 |
| 796. Only two waves are propagated | 393 |
| 797. The theory agrees with that of Fresnel | 394 |
| 798. Relation between electric conductivity and opacity | 394 |
| 799. Comparison with facts | 395 |
| 800. Transparent metals | 395 |
| 801. Solution of the equations when the medium is a conductor | 395 |
| 802. Case of an infinite medium, the initial state being given | 396 |
| 803. Characteristics of diffusion | 397 |
| 804. Disturbance of the electromagnetic field when a current begins to flow | 397 |
| 805. Rapid approximation to an ultimate state | 398 |
Chapter XXI.
Magnetic Action on Light.
| 806. Possible forms of the relation between magnetism and light | 399 |
| 807. The rotation of the plane of polarization by magnetic action | 400 |
| 808. The laws of the phenomena | 400 |
| 809. Verdet's discovery of negative rotation in ferromagnetic media | 400 |
| 810. Rotation produced by quartz, turpentine, &c., independently of magnetism | 401 |
| 811. Kinematical analysis of the phenomena | 402 |
| 812. The velocity of a circularly-polarized ray is different according to its direction of rotation | 402 |
| 813. Right and left-handed rays | 403 |
| 814. In media which of themselves have the rotatory property the velocity is different for right and left-handed configurations | 403 |
| 815. In media acted on by magnetism the velocity is different for opposite directions of rotation | 404 |
| 816. The luminiferous disturbance, mathematically considered, is a vector | 404 |
| 817. Kinematic equations of circularly-polarized light | 405 |
