"In the summer of 1797 the author, then in ill health, had retired to a lonely farmhouse between Porlock and Linton, on the Exmoor confines of Somerset and Devonshire. In consequence of a slight indisposition, an anodyne had been prescribed, from the effects of which he fell asleep in his chair at the moment that he was reading, the following sentence, or words of the same substance, in Purchas's _Pilgrimage_:--'Here the Khan Kubla commanded a palace to be built, and a stately garden thereunto. And thus ten miles of fertile ground were enclosed by a wall.' The Author continued for about three hours in a profound sleep, at least of the external senses, during which time he has the most vivid confidence that he could not have composed less than from two to three hundred lines; if that indeed can be called composition in which all the images rose up before him as things, with a parallel production of the corresponding expressions, without any sensation or consciousness of effect. On awaking he appeared to himself to have a distinct recollection of the whole, and, taking his pen, ink, and paper, instantly and eagerly wrote down the lines that are here preserved. At this moment he was unfortunately called out by a person on business from Porlock, and detained by him above an hour, and on his return to his room found, to his no small surprise and mortification, that though he still retained some vague and dim recollection of the general purport of the vision, yet, with the exception of some eight or ten scattered lines and images, all the rest had passed away like the images on the surface of a stream into which a stone has been cast, but, alas! without the after restoration of the latter." This poem, though written in 1797, remained, like _Christabel_, in MS. till 1816. These were then published in a thin quarto volume, together with another piece called the _Pains of Sleep_, a composition of many years' later date than the other two, and of which there will be occasion to say a word or two hereafter.