A Vision. An Explanation of Life Founded upon the Writing of Giraldus and upon certain Doctrines attributed to Kusta Ben Luka. With frontis portrait of Giraldus and another of The Great Wheel. Limited edition of 600 copies , Signed by W.B. Yeats. London: Werner Laurie, 1925. Pp xxiii, 256, uncut. Quarter parchment, paper boards, original plain grey dust jacket with title label to spine. Light spotting to covers and browning to fore-edges, some gatherings unopened. A very good example in scarce dust jacket. Yeats explained his own philosophy in this prose work, a meditation upon the relation between imagination, history, and the occult. He spent an extraordinary ten years in the research and writing of this book and felt that the poetry he wrote afterwards was significantly informed by his studies for it. He writes here, '..I wished for a system of thought that would leave my imagination free to create as it chose..' Yeats published his intricate and not completely systematic theories of personality and history in A Vision (1925; substantially revised in 1937), and some of the symbolic patterns (gyres, moon phases) with which he organized these theories provide important background to many of the poems and plays he wrote during the second half of his career.