physical that is both itself and a suggestion of other, perhaps immaterial, timeless qualities. Unlike the modernists who experimented with free verse, Yeats was a master of the traditional forms. The impact of modernism on his work can be seen in the increasing abandonment of the more conventionally poetic diction of his early work in favour of the more austere language and more direct approach to his themes that increasingly characterises the poetry and plays of his middle period, comprising the volumes In the Seven Woods, Responsibilities and The Green Helmet. His later poetry and plays are written in a more personal vein, and the works written in the last twenty years of his life include mention of his son and daughter, as well as meditations on the experience of growing old. In his poem "The Circus Animals' Desertion", he describes the inspiration for these late works: Now that my ladder's gone I must lie down where all the ladders start In the foul rag and bone shop of the heart. During 1929, he stayed at Thoor Ballylee near Gort in County Galway (where Yeats had his summer home since 1919) for the last time. Much of the remainder of his life was lived outside Ireland, although he did lease Riversdale house in the Dublin suburb of Rathfarnham in 1932. He wrote prolifically through his final years, and published poetry, plays, and prose. In 1938, he attended the Abbey for the final time to see the premiere of his play Purgatory. His Autobiographies of William Butler Yeats was published that same year. The preface for the English translation of Rabindranath Tagore's Gitanjali (Song Offering) (for which Tagore won the Nobel prize in Literature) was written by Yeats in 1913. While Yeats's early poetry drew heavily on Irish myth and folklore, his later work was engaged with more contemporary issues, and his style underwent a dramatic transformation. His work can be divided into three general periods. The early poems are lushly pre-Raphaelite in tone, self-consciously ornate, and, at times, according to unsympathetic critics, stilted. Yeats began by writing epic poems such as The Isle of Statues and The Wanderings of Oisin. His other early poems are lyrics on the themes of love or mystical and esoteric subjects. Yeats's middle period saw him abandon the pre-Raphaelite character of his early work and attempt to turn himself into a Landor-style social ironist. Critics