Not the least interesting portion of this extraordinary edifice dedicated to the worship of so many gods and heroes, was the small chapel of Pandrosos, where Pandora and Thallo were said to have lived, and where the ashes of Cecrops reposed. Here dwelt the priestess, shut up for several months with the Ersephoræ. This cella may, therefore, be said to have belonged not only to Pandrosos, who was one of the earliest ministers of these rites, but to all who from her received the office. The building opened on the south into a portico, adorned with Caryatides instead of columns, and filled with ceremonial and religious associations. Here grew the Pancuphos, or sacred olive tree, which, burned by the Persians, shot up a cubit in a single night, and was thought to be endued with the power of undying vegetation, for, if the trunk were cut down, new shoots immediately succeeded. Near the sacred olive was the salt well, called the sea of Erectheus, which Poseidon is said to have produced by smiting the rock with his trident. In the hollow of this fountain, during the prevalence of the south wind, a sound like the murmuring of the waves was supposed to be heard. This well has not been discovered in modern times; but in another part of the citadel there existed a spring of brackish water, known by the name of the Clepsydra, which, about the rising of the dog-star, while the Etesian winds were blowing, overflowed; but on their cessation again subsided.[264] Footnote 264: This fountain was likewise called Empedo.—Sch. Arist. Vesp. 857. I may here mention, by the way, that most ancient cities were supplied with water by pipes underground, as Syracuse.—Thucyd. vi. 100. Cf. Sch. Arist. Achar. 1145.