The object of this paper was to ascertain the position of the Athenian and Syracusan lines from the language employed by Thucydides, particularly the prepositions. The author was led to examine the account of these lines given by Goellen and Dr Arnold, in their editions of Thucydides, and the maps they have subjoined, and to compare them with the historian's descriptions. He pointed out the error into which both seem to have fallen, respecting the fortifications of Temnites, as it did not appear, from the historian's statement, that the district was entirely inclosed, but only that part fronting Epipolæ. He also endeavoured to shew that the cross wall, built by the Syracusans, to intercept the Athenian lines in the direction of Trogilus, could not have been constructed on the south of the Temnites, as Dr Arnold supposes, but on the north of the slope of Epipolæ, and that it was not entirely destroyed by the Athenians.