So do I feel in this court-yard of Chepstow Castle, whilom the Est-brig-hoel of Doomsdaye Booke, and in later times so blended with English history. See you not the Conqueror and his knights in panoply on prancing steeds before you? See you not Fitz Osborne and Warren, its former lords, loom out upon your sight? And, lo! the portal opens, and the dungeon of Henry Martin, the regicide, yawns like a bottomless pit before us. The shade of Charles Stewart rises; and again the phantom of Cromwell, uttering his epithets of scorn, as if the wanton puritan were about to dash the ink in the face of his colleague as he signed the death-warrant of the king. And now the scene changes, and behold the doomed one is chained to those massive rings of iron, and there with groaning dies. EV. I am most willing that you should thus indulge in your wild rhapsody, Astrophel, for it is the happy illustration of one potent cause of spectral illusion—_association_. There are few whose minds are not excited in some degree when they tread the localities of interesting events. By memory and its combinations something like an inspired vision may often seem to come over us—a day-dream. Or, if we have been brooding over a subject or gazing on the relics of departed or absent love and friendship: or while we stand on a spot consecrated by genius, or when we have passed the scene of a murder, still will association fling around us its visionary shadows. Shortly after the death of Maupertuis, the president of the Academy of Berlin, Mr. Gleditsch, the curator of natural history, was traversing the hall in solitude, when he saw the phantom of the president standing in an angle of the room with his eyes intensely fixed on him: an effect perfectly explicable by the association of intense impression of memory in the very arena of the president’s former dignity. You will remember the story of a rich libertine, told by Sir Walter Scott. Whenever he was alone in his drawing-room, he was so haunted by a spectral _corps de ballet_, that the very furniture was, as it were, converted into phantoms. To release himself from this unwelcome intrusion he retired to his country house, and here, for a while, he obtained the quiet which he sought. But it chanced that the furniture of his town house was sent to him in the country, and on the instant that his eyes fell on his drawing-room chairs and tables, the illusion came afresh on his mind. By the influence of association the green figurantes came frisking and capering into his room, shouting in his unwilling ears, “Here we are! here we are!” It is not, however, essential that there be substance at all to excite these spectres. _Idea_ alone is sufficient.