The twenty-first Yeats International Summer School was held in Sligo in 1980, and the Yeats Society, wishing to mark the school’s coming of age, asked Professor A. Norman Jeffares to edit a volume of essays specially com missioned for the occasion. These essays are by Directors of the school and scholars who have lectured at it. These essays show the breadth of Yeats studies, indicating eloquently the tremendous hold that Yeats exerts on scholar and general reader alike, stressing that he is the greatest poet Ireland and the twentieth century have produced.