原著信息：

“The theory of electrons, and its applications to the phenomena of light and radiant heat ”，by Lorentz, Hendrik Antoon, 1853-1928, published 1909；

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相关内容地址：https://archive.org/stream/theoryofelectron00loreuoft#page/229/mode/1up

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“I cannot speak here of the many highly interesting applications that Einstein has made of this principle, his results concerning electromagnetic and optical phenomena （leading to the same contradiction with Kaufmann’s results that was pointed out in §179）) agree in the main with whose which we have obtained in the preceding pages, the chief difference being that Einstein simply postulates what we have deduced, with some difficulty and not altogether satisfactorily, from the fundamental equations of electromagnetic field. By doing so, he may certainly take credit for making us see in the negative result of experiments like those of Michelson, Rayleigh, and Brace, not a fortuitous compensation of opposing effects, but the manifestation of a general and fundamental principle.”

“Yet, I think, something may also be claimed in favor of the form in which I have presented the theory. I cannot but regard the ether, which can be the seat of an electromagnetic field with its energy and vibrations, as endowed with a certain degree of substantiality, however different it may be from all ordinary matter. In this line of thought, it seems natural not to assume at starting that it can never make any difference whether a body moves through the ether or not, and to measure distances and lengths of time by means of rods and clocks having a fixed position relatively to the ether. ”

“It would be unjust not to add that, besides the fascinating boldness of its starting point, Einstein’s theory has another marked advantage over mine. Whereas I have not been able to obtain for the equations referred to moving axes exactly the same form as for those which apply to a stationary system, Einstein has accomplished this by means of a system of new variables slightly different from those which I have introduced. I have not availed myself of his substitutions, only because the formulae are rather complicated and look somewhat artificial, unless one deduces them from the principle of relativity itself.”

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