Correspondence to Edward Appleton, dated 1958. The material is mainly regarding the proposed absorption of the M.C.I. (Mixed Commission on the Ionosphere) as a Sub-Committee of U.R.S.I. (Union Radio-Scientifique Internationale) Commission III. Appleton considered this undesirable and sent a circular letter, and received letters of support which are included in the folder. Also included are versions of Appleton's contributions to the New York meeting (for publication), and an undated draft paper 'Some notes on the Interpretation of l.G.Y. (International Geophysical Year) Ionospheric Interpretations'.