The papers were assembled after a considerable lapse of time and have inevitably many gaps. There is little record of Milne's overseas travel for research and conferences or his committee and editorial work, while the correspondence is clearly no more than a fraction of the original corpus. There are lectures, notes and drafts, which give some indication, albeit incomplete, of the range of Milne's mathematical and astrophysical interests. The correspondence contains two sequences of very diverse interest: on the one hand the letters of the young Milne to his parents and brother, mainly during and just after the First World War, and on the other hand an extensive correspondence with S. Chandrasekhar, 1929-1950 (photocopies made available from the Chandrasekhar archives in the Joseph Regenstein Library, University of Chicago). These, while chiefly on technical subjects and especially Milne's growing belief in kinematic relativity, also contain many insights into his later family life, bereavements and daily struggles during and after the Second World War.