He seems in his speculations to have lit on that memory of nature the visionaries claim for the foundation of their knowledge; but I do not know whether he thought, as they do, that all things good and evil remain for ever, 'thinking the thought and doing the deed,' though not, it may be, self-conscious; or only thought that 'love and beauty and delight' remain for ever. The passage where Queen Mab awakes 'all knowledge of the past,' and the good and evil 'events of old and wondrous times,' was no more doubtless than a part of the machinery of the poem, but all the machineries of poetry are parts of the convictions of antiquity, and readily become again convictions in minds that dwell upon them in a spirit of intense idealism. Intellectual Beauty has not only the happy dead to do her will, but ministering spirits who correspond to the Devas of the East, and the Elemental Spirits of mediæval Europe, and the Sidhe of ancient Ireland, and whose too constant presence, and perhaps Shelley's ignorance of their more traditional forms, give some of his poetry an air of rootless phantasy. They change continually in his poetry, as they do in the visions of the mystics everywhere and of the common people in Ireland, and the forms of these changes display, in an especial sense, the glowing forms of his mind when freed from all impulse not out of itself or out of supersensual power. These are 'gleams of a remoter world which visit us in sleep,' spiritual essences whose shadows are the delights of all the senses, sounds 'folded in cells of crystal silence,' 'visions swift and sweet and quaint,' which lie waiting their moment 'each in his thin sheath like a chrysalis,' 'odours' among 'ever-blooming eden trees', 'liquors' that can give 'happy sleep,' or can make tears 'all wonder and delight'; 'The golden genii who spoke to the poets of Greece in dreams'; 'the phantoms' which become the forms of the arts when 'the mind, arising bright from the embrace of beauty,' 'casts on them the gathered rays which are reality'; the 'guardians' who move in 'the atmosphere of human thought' as 'the birds within the wind, or the fish within the wave,' or man's thought itself through all things; and who join the throng of the happy hours when Time is passing away-- 'As the flying fish leap From the Indian deep, And mix with the seabirds half asleep.' It is these powers which lead Asia and Panthea, as they would lead all the affections of humanity, by words written upon leaves, by faint songs, by eddies of echoes that draw 'all spirits on that secret way,' by the 'dying odours' of flowers and by 'the sunlight of the sphered dew,' beyond the gates of birth and death to awake Demogorgon, eternity, that 'the painted veil' 'called life' may be 'torn aside.' There are also ministers of ugliness and all evil, like those that came to Prometheus--