Letter from Rudolf Ernst Peierls, on a paper 'The enumeration of graphs in the Feynman-Dyson technique' by C A Hurst, to D C Martin, assistant secretary of the Royal Society Paper reference code: A266 Peierls writes: 'Dear Martin, I enclose paper A 266 and my report on it. In a recent letter you reported approval of my suggestion that I contact Professor Dirac, but in the meantime I think I have understood what the main point is about the paper and I have decided not to trouble Dirac. Yours sincerely, R E Peierls'. Written at the Department of Mathematical Physics, The University, Edgbaston, Birmingham [England]. [Published in Proceedings A, 1952]. Endorsed on recto as received 8 December 1951. 6 December 1951