IN the first place I am deeply indebted to Mrs. W. B. Yeats, with whose sanction the biography has been written. She has placed her recollections at my disposal as well as the relevant records, manuscripts and letters in her possession. Next I must acknowledge similar kindnesses on the part of W. B. Yeats' sisters, Lily Yeats and Elizabeth Yeats, and on that of his brother, Jack B. Yeats.
My grateful thanks are due to Mr. Jack Grene for helping me to revise the manuscript and for various suggestions, and to Mr. Cecil Salkeld, to Mr. Oliver Edwards and Mr. Monk Gibbon for their advice and assistance in regard to certain chapters; and among Yeats' friends who have talked and/or corresponded with me on the subject of his life and work, I should mention especially Madame Gonne MacBride (Maud Gonne) and, after her, the late F. R. Higgins, T. E. Sturge Moore, Dr. F. P. Sturm, Captain Dermot MacManus, Miss Edith Shackleton, Miss Norah Heald, Sir William Rothenstein, Dr. M. Rossi, Miss Edith Sitwell, Mrs. Stuart (Iseult Gonne), General Sir Ian Hamilton, Miss Ethel Mannin, Mrs. Llewelyn Davies and Richard Best.
I am under great obligation to the following: Dr. Thomas Bodkin, Mr. G. R. Barnes, Mr. L. A. G. Strong, Dame Edith Lyttelton (the Hon. Mrs. Alfred Lyttelton); to Dr. Bodkin for accounts of Yeats' work as a Senator; to Mr. Barnes for a description of Yeats' broadcasting; to Mr. L. A. G. Strong for his picture of Yeats' life at Oxford; and to Dame Edith Lyttelton for a passage on Yeats and Psychical Research.
Letters written by the late Robert Bridges are quoted by permission of his executors; letters written by the late George Moore, with acknowledgments to Mr. C. D. Medley; letters by John