Correspondence with colleagues and friends after delivery and publication of Blackett's Presidential Address to the British Academy. Correspondence with Dame Isobel Cripps, Geoffrey Crowther (later Baron Crowther of Headingley), Sir Charles Goodeve, T.G.N. Haldane, Sir Julian Huxley, Charles Judd, Richard Kahn (later Lord Kahn) and Ben Lockspeiser. c.1957