Three circumstances in the narrative of Herodotus, respecting this work, deserve special notice. First, the superior intelligence of the Phenicians, who, within sight of that lofty island of Thasos which had been occupied three centuries before by their free ancestors, were now laboring as instruments to the ambition of a foreign conqueror. Amidst all the people engaged, they alone took the precaution of beginning the excavation at a breadth far greater than the canal was finally destined to occupy, so as gradually to narrow it, and leave a convenient slope for the sides: the others dug straight down, so that the time as well as the toil of their work was doubled by the continual falling in of the sides,—a remarkable illustration of the degree of practical intelligence then prevalent, since the nations assembled were many and diverse. Secondly, Herodotus remarks that Xerxes must have performed this laborious work from motives of mere ostentation: “for it would have cost no trouble at all,” he observes,[36] “to drag all the ships in the fleet across the isthmus; so that the canal was nowise needed.” So familiar a process was it, in the mind of a Greek of the fifth century B. C., to transport ships by mechanical force across an isthmus; a special groove, or slip, being seemingly prepared for them: such was the case at the Diolkus across the isthmus of Corinth. Thirdly, it is to be noted, that the men who excavated the canal at Mount Athos worked under the lash; and these, be it borne in mind, were not bought slaves, but freemen, except in so far as they were tributaries of the Persian monarch; and that the father of Herodotus, a native of Halikarnassus, and a subject of the brave queen Artemisia, may perhaps have been among them. We shall find other examples as we proceed, of this indiscriminate use of the whip, and full conviction of its indispensable necessity, on the part of the Persians,[37]—even to drive the troops of their subject-contingents on to the charge in battle. To employ the scourge in this way towards freemen, and especially towards freemen engaged in military service, was altogether repugnant both to Hellenic practice and to Hellenic feeling: the Asiatic and insular Greeks were relieved from it, as from various other hardships, when they passed out of Persian dominion to become, first allies, afterwards subjects, of Athens: and we shall be called upon hereafter to take note of this fact, when we appreciate the complaints preferred against the hegemony of Athens. [36] Herodot. vii, 24: ὡς μὲν ἐμὲ συμβαλλεόμενον εὑρίσκειν, μεγαλοφροσύνης εἵνεκα αὐτὸ Ξέρξης ὀρύσσειν ἐκέλευε, ἐθέλων τε δύναμιν ἀποδείκνυσθαι, καὶ μνημόσυνα λιπέσθαι· παρεὸν γὰρ, ~μηδένα πόνον λαβόντας~, τὸν ἰσθμὸν τὰς νέας διειρύσαι, ὀρύσσειν ἐκέλευε διώρυχα τῇ θαλάσσῃ, εὖρος ὡς δύο τριήρεας πλέειν ὁμοῦ ἐλαστρευμένας.