This collection brings together all the published essays of W. B. Yeats on Irish folklore, myth, and tradition, including topics such as ghosts, abductors, fairies, ancient tribes, precious stones, and Gaelic love hymns. Through his research into Irish folklore, Yeats sought to create a literary movement that is enriched and rooted in a vibrant native tradition. In this volume, Yeats's essays, introductions, and sketches are presented chronologically, providing a clear picture of the development of his analysis, which becomes increasingly deeper and more complex in his quest to create an Ireland of the imagination.