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viii some confusion was bound to arise between the phenomena appertaining to each. In particular, the preliminary researches which the author had made on the velocity of propagation of "X" rays apply in reality not to "X" rays, but to "N" rays. He had found that the velocity of propagation was the same as that of Hertzian waves, and consequently of light. Since the properties of "N" rays, taken in their entirety, do not leave any doubt that these rays are a variety of light, this determination of their velocity is nothing more than a verification of an assured fact. Nevertheless, this verification seemed not altogether superfluous; it proves at least that the experiments have been carried out with care.