Correspondence between John Cockcroft and the Royal Society General correspondence, including a letter from D A Jackson requesting some Indium 113 from Harwell, forwarded to Cockcroft; Cockcroft's correspondence on the admissions of D H Wilkinson and W E Burcham; and a proposal for a symposium on fallout, with other matters. Letters to and from the Assistant Secretary, David Christie Martin, and the Librarian, Igor Kaye. The original file featured the typed name and address: 'Sir John Cockcroft, O.M., K.C.B., C.B.E., F.R.S., Churchill College, Cambridge'. 26 July 1954-14 March 1961