SHORTLY after the first application of radioactive isotopes as indicators, the late H. J. G. Moseley and one of the present writers discussed the prospect opened by the introduction of this method, when indulging in a cup of tea at the Manchester Physics Laboratory. The latter then expressed the wish that an indicator might be found which would allow one to determine the fate of the individual water molecules contained in the cup of tea consumed. Even a man of the vision and outlook of the late H. J. G. Moseley considered this hope to be a highly Utopian one.
H. J. Emeléus, F. W. James, A. King, T. G. Pearson, R. H. Purcell and H. V. A. Briscoe, J. Chem. Soc., August, p. 1207, 1934.
G. v. Hevesy and E. Hofer, Hoppe-Seylers Z., 225, 28 ; 1934. cf. also G. N. Lewis, Science, 79, 151 ; 1934. H. Erlenmeyer and H. Gärtner, Helvet. chim. Acta, 17, 334 ; 1934.