The letters in this volume, the majority never before published, vividly document a tunultuous period in Yeats's life. They chart his transformation from a late Romantic, `Celtic' poet into a powerful and astringent modernist, the foundation of the Abbey Theatre and development of his own palywriting career, the emotional devastation of his beloved Maud Gonne's marriage to a man he despised, the encouragement of promising young writers including Joyce and Synge, and the impact of his first exposure to the United States. Letter by letter we see how private concerns and public controversies forced him to redefine his views on artistic freedom and responsibility, and to reshape his style. Rich and readable notes provide a narrative of these years, explaining allusions, and setting the correspondence in its cultural and political contexts as well as relating it to Yeats's canon as a whole. This book will be indispenable to anyone interested in the development of modern poetry, drama, and cultural history.