port" (e)/reisma) of Athens, partly in the physical sense of "firm basis," partly also with the notion that the land had a safeguard in the benevolence of those powers to whose nether realm the "threshold" led.
Evidence from Istros.This view is more than a conjecture; it can be supported by ancient authority. Istros, a native of Cyrene, was first the slave, then the disciple and friend, of the Alexandrian poet Callimachus; he lived, then, about 240 B.C., or less than 170 years after the death of SophoclesMüller, Fragm. Hist. I., lxxxv., 418.. He is reckoned among the authors of Atthides, having written, among other things, a work entitled *)attika/, in at least sixteen books. In the later Alexandrian age he was one of the chief authorities on Attic topography; and he is quoted six times in the ancient scholia on the Oedipus Coloneus. One of these quotations has not (so far as I know) been noticed in its bearing on the point now under discussion; it does not occur in the scholium on v.