Light, Magnetism, and Electricity

From Chapter 1 after a discussion of light as a wave vs light as a particle...

For two centuries after Newton, physicists vacillated between these two points of view: waves and particles. The former required an ether, the latter did not. This volume will be devoted, in good part, to the details of this vacillation between the two views. In the eighteenth century, the particle view was dominant; in the nineteenth, the wave view. Then, as the twentieth century opened, a curious thing happened—the two views melted into each other and became one!