Abstract
IN a paper communicated to the American Physical Society at the New York meeting on February 29, the writer, in collaboration with Dr. F. C. Brown, showed that the part of the translational kinetic energy of the negative ions emitted by hot platinum, which depends on their component of velocity normal to the emitting surface, has the same mean value as the corresponding quantity for a molecule of gas at the temperature of the metal, and further, that that component of the velocity is distributed among the different ions according to Maxwell's law of distribution of velocity among the molecules of a gas. Since then Dr. Brown has succeeded in showing that the same laws hold for the positive ions emitted by hot platinum.
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