Concerning the Relation Between the Velocity of Propagation of Light and the Density and Composition of Media

Abstract

The electromagnetic theory of light which was formulated by Maxwell 2) in 1865 has since, especially through the experiments of various physicists on the specific inductive capacity of nonconducting media, acquired a high degree of credibility. Although I consider it exceedingly probable that a change in our conceptions as regards electric phenomena will lead also in some degree to an alteration in the theory of Maxwell, I still hold that its main principle, i.e., the hypothesis that vibrations of light are movements of the same character as electric currents, can hardly be questioned. It appeared therefore to me to be desirable to make a further investigation of the results of this theory which have as yet been only partially compared with experience. By this means it will not only be possible to estimate the value of the theory, but if it is correct there is also a chance that the investigation of light phenomena may advance to some extent our knowledge of the action of electricity.