In 1889 when Yeats and Ellis were well into their study of Blake, Yeats published the little volume of poems called Crossways. Yeats conveniently forgets that to Blake 'vegetable world' was a term of opprobrium. It is this sort of enquiry which one must carry over from Yeats' prose into his poetry to see whether his search for belief is merely background mythology or an integral part of his creative work. However, in his championship of fairies and such magical beings, Yeats undoubtedly felt that he was following in Blake's footsteps. Yeats' magic manifests itself rather in theory, both in the occult and pantheistic background of Anima Mundi, and in the more geometrical doctrines of A Vision. As corollaries to the primary concern about the effect of saint and enchanter on Yeats' poetry, one must examine these three things, nature imagery, poetic technique, and background theory.