... 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.” ...
Lovecrafts Commonplace Book 47 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) ...
Stories to be told of a certain person s appearance in public, of his having been seen in various situations, and of his making visits in private circles ; but finally, on looking for this person, to come upon his old grave and mossy tombstone.
Lovecrafts Commonplace Book 44 Castle by pool or river — reflection fixed thro’ centuries — castle destroyed, reflection lives to avenge destroyers weirdly.
Lovecrafts Commonplace Book 42 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?]
Lovecrafts Commonplace Book 40 Warning that certain ground is sacred or accursed; that a house or city must not be built upon it—or must be abandoned or destroyed if built, under penalty of catastrophe.
Lovecrafts Commonplace Book 36 Disintegration of all matter to electrons and finally empty space assured, just as devolution of energy to radiant heat is known. Case of acceleration — man passes into space.