Foreshadowing Elements of Atomic Numbers 75, 85, 87, and 93 by means of X-rays

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IN your columns of Current Topics and Events, Dec. 26, 1925, p. 943, I notice a critical abstract of a series of articles by Dr. Druce and myself, relative to the existence of elements of atomic numbers 75, 85, 87, and 93, which appeared in the Chemical News, Oct. 30, Nov. 6, 13, 20, and 27. A later communication in the issue of Dec. 11, 1925, should be included, as reference will be made to it below.

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