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 inclosed with 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 correspondent expressions, without any sensation or consciousness of effort.

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!" Opinion will ever vary as to its poetic worth.

Coleridge himself professed to consider it "rather as a psychological curiosity" than as a thing "of any supposed _poetic_ merits"; to Lamb he repeated it "so enchantingly that it irradiates and brings heaven and elysian bowers into any parlour when he sings or says it," and it has been a sort of touchstone of romantic taste ever since.