A profoundly scholarly study of Yeats from the side of poetry, with emphasis on all elements which made up his achievement. Two main channels influenced his work, -- the Irish background and the English Aesthetic movement. These are studied and their relative values weighed. The work of his early period is related to his later development, the sources and influences are discussed. And through this one arrives at the man, relating his realism in his work to the drawn life which encompassed him. Not a book for a casual student of the art of poetry. One needs to be very familiar with Yeats and the period he represents. Colleges primarily.