1. L. Meitner, “Das β-Strahlenspektrun von UX1 und seine Deutung,” Z.Phys. 17 (1923), 54–66. Even if Meitner had finished her investigation in January 1923, her paper was not submitted to the Zeitschrift until June 1923.
2. Meitner to Ellis, 19 January 1923, MTNR 5/4.
3. Hahn to Hevesy, 20 January 1923, Hevesy Scientific Correspondence, Niels Bohr Archive.
4. Meitner, “β-Strahlenspektrum” (note 1), p. 58.
5. If these values are to be correct, two of the values in Table 4.3 most be in error (editors’ note).