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I cannot but regard the ether, which can be the seat of an electro-magnetic field with energy and its vibrations, as endowed with a certain degree of substantiality ….
— Hendrik Lorentz (1909)
The Theory of Electrons: and it’s Application to the Phenomena Of Light and Radiant Heat
B G Teubner, p. 230
B G Teubner, p. 230