On Yeats'Transmutation of Symbolism-Through the analysis of three poems

Yeats'poems are famous for the use of symbolism.His symbolism is characterized by continuous development,which can be roughly divided into three phases:the early phase-from 1889 to 1904,the middle phase-from 1919 to 1925,and the late phase-the years after 1925.We can see poems with different characters of symbolism in his different phases.In this paper,three poems are to be chosen to show his transmutation of symbolism.