From Arabia Encyc. Britan. II—255
Prehistoric fabulous tribes of Ad in the south, Thamood in the north, and Tasm and Jadis in the centre of the peninsula. “Very gorgeous are the descriptions given of Irem, the City of Pillars (as the Koran styles it) supposed to have been erected by Shedad, the latest despot of Ad, in the regions of Hadramaut, and which yet, after the annihilation of its tenants, remains entire, so Arabs say, invisible to ordinary eyes, but occasionally and at rare intervals, revealed to some heaven-favoured traveller.” // Rock excavations in N.W. Hejaz ascribed to Thamood tribe.
Visitor from tomb—stranger at some publick concourse followed at midnight to graveyard where he descends into the earth.
Race of immortal Pharaohs dwelling beneath pyramids in vast subterranean halls down black staircases.
Castle by pool or river—reflection fixed thro’ centuries—castle destroyed, reflection lives to avenge destroyers weirdly.
Fear of mirrors—memory of dream in which scene is altered and climax is hideous surprise at seeing oneself in the water or a mirror. (Identity?) [Outsider?]