Similar remarks may be made about the waves of the undulatory theory of light, and about the electric and magnetic forces of which we have hitherto imagined them to be constituted. Energy may be transferred from place to place, but the waves and the electric and magnetic forces are not part of the mechanism of transfer; they are part simply of our efforts to understand this mechanism and picture it to ourselves. Before man appeared on the scene, there were neither waves nor electric nor magnetic forces; these were not made by God, but by Huyghens, Fresnel, Faraday and Maxwell.
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