Theories of Energy

ement. The velocity of light is not only different in different media, giving rise to refraction, but the velocities of the different manners are different in the same medium, so that the ratios of velocities of the different manners in any two media are different, the dispersion of the colours through refraction being due to this fact. The subject of colour will be considered in a subsequent chapter. Here it will be sufficient to say, that, under the theory, it is supposed that the different manners represent different hues, so that when the different manners of light are separated in the spectrum of high dispersion, decrease in the intensity of any of the manners becomes apparent. Under the theory it is supposed that when light passes through a gas or vapour, the gas or vapour is energized centroatomically by some of the manners of the light, depending on the energizability of the matter, different substances being energizable by different manners, a substance being especially energizable, centroatomically, by the manners which agree with -the manners of its own energy when augmented, all other manners being transmitted transatomically, being the misceous method of energizement. The manners of light which energize the gaseous matter centroatomically spend themselves in such energizement, being thereby eliminated from the transmitted light, andtheir places in the transmitted light are taken by the manners of the centroatomic energy, and when the ener...