Attribution: Dickens writes to Mackay on 15 September 1868. 'I have no doubt I shall be pleased with "Walks and Talks with the people". The MS will be found awaiting me at the Office tomorrow, I take it. Mephistopheles is already in', The Letters of Charles Dickens, ed. by Graham Storey, Kathleen Tillotson and others, Pilgrim Edition, 12 vols (Oxford: Clarendon Press, 1965-2002), XII, p. 183.