The Macmillan Archive in its various locations — the British Library, the University of Reading, the firm's Basingstoke warehouse and even for a while in an apple barn at Birch Grove House (where I interviewed the late Lord Stockton) — has been the basis of much of my published research on W. B. Yeats's texts for more than twenty years.¹ Its sweep is comprehensive, from the Readers' Reports which rejected Yeats in 1900,² to his correspondence with Sir Frederick Macmillan and his successors, to that of his wife and executrix with Harold Macmillan, his trusted publisher's reader Thomas Mark, and Mark's protege, Mr Tim Farmiloe, who is now Director of Macmillan Press.³