Page:Aether and Matter, 1900.djvu/31

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vibrations of the molecular system: the methods of dynamics of particles adequate to the problem: the system referred to rotational coordinates; the condition for circular principal vibrations. Any purely constitutive potential energy for the molecule leads to the Zeeman phenomena, with the requisite generality. Inference as to effective isotropy of the molecule. The Faraday effect and Becquerel's law of dispersion deduced from the Zeeman effect when the freely mobile electrons are all negative; or when the dispersion is controlled by one absorption band, or by several bands for which the Zeeman constant is the same. Optical rotations necessarily of dispersional type; and therefore not simply related to material structure. Direct kinematic analysis of optical rotations for crystalline media, b y reference to rotating frame: law of rotation in different directions: the permanent types of vibration when rotation is superposed on double refraction: problem of refraction into a chiral medium not determinate.
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