Intra-Atomic Charge

IN a previous letter to NATURE (July 20, 1911, p. 78) the hypothesis was proposed that the atomic weight being equal to about twice the intra-atomic charge, ``to each possible intra-atomic charge corresponds a possible element,'' or that (Phys. Zeitschr., xiv., 1912, p. 39), ``if all elements be arranged in order of increasing atomic weights, the number of each element in that series must be equal to its intra-atomic charge.''