I must first state my conviction that the parasang, like its representative, the modern farsang or farsakh of Persia, was not a measure of distance very accurately determined, but rather indicated a certain amount of time employed in traversing a given space. That Xenophon reckoned by the common mode of computation of the country is evident, by his employing, almost always, the Persian "parasang," instead of the Greek stadium; and that the parasang was the same as the modern hour, we find by the distance between Larissa (Nimroud) and Mespila (Kouyunjik) being given as six parasangs, corresponding exactly with the number of hours assigned by the present inhabitants of the country, and by the authorities of the Turkish post, to the same road. The six hours in this instance are equal to about eighteen English miles. The ford, by which the Greeks crossed the Great Zab (Zabates) may, I think, be accurately determined. It is still the principal ford in this part of the river, and must, from the nature of the bed of the stream, have been so from the earliest periods. It is about twenty-five miles from the confluence of the Zab and Tigris.[11] The Greeks could not have crossed the Zab above the spot I have indicated, as the bed of the river is deep, and confined within high rocky banks. They might have done so _below_ the junction of the Ghazir, and a ravine worn by winter rains may correspond with the valley mentioned by Xenophon, but I think the Ghazir far more likely to have been the torrent bed viewed with so much alarm by the Greek commander, and the passage of which Mithridates might have disputed with some prospect of success.[12] That Larissa and Mespila are represented by the ruins of Nimroud and Kouyunjik no one can reasonably doubt. Xenophon's description corresponds most accurately with the ruins and with the distance between them. From Mespila the Greeks marched four parasangs, and probably halted near the modern village of Batnai, between Tel Kef and Tel Eskof, an ancient site exactly four hours, by the usual caravan road, from Kouyunjik. Instead of fording the Khabour near its junction with the Tigris, and thus avoiding the hills, they crossed them by a precipitous pass to the site of the modern Zakko. They reached this range in four days, traversing it on the fifth, probably by the modern caravan road. They were probably much retarded during the last day, by having to fight their way over three distinct mountain ridges. It is remarkable that Xenophon does not mention the Khahour, although he must have crossed that river either by a ford or by a bridge[13] before reaching the plain. Yet the stream is broad and rapid, and the fords at all times deep. Nor does he allude to the Hazel, a confluent of the Khabour, to which he came during his first day's march, after leaving Zakko. These omissions prove that he does not give an accurate itinerary of his route.