The correspondence consists chiefly of letters to Dudley Sommer, with a few drafts and, from 1958, several copies in typescript carbon of his replies. A few transcripts of letters of J S Haldane sent to him during his researches are also enclosed.
Press cuttings containing reviews, some of which give rise to correspondence with reviewers and editors, are contained in the chronological sequence (chiefly May-July 1960).