In the summer of the year 1797, the Author, then in ill health, had retired to a lonely farm-house 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 effect of which he fell asleep in his chair at the moment 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