Major Rennell (Illustrations of the Expedition of Cyrus, pp. 79-87, etc.), Ritter, (Erdkunde, x, p. 16), Koch, (Zug der Zehn Tausend, pp. 46, 47), and Mr. Ainsworth (Travels in the Track of the Ten Thousand, p. 88) consider Xenophon to state that the Cyreian army on this day’s march (the day but one before the battle) passed through the Wall of Media and over the four distinct canals reaching from the Tigris to the Euphrates. They all, indeed, contest the accuracy of this latter statement; Rennell remarking that the level of the Tigris, in this part of its course, is lower than that of the Euphrates; and that it could not supply water for so many broad canals so near to each other. Col. Chesney also conceives the army to have passed through the Wall of Media before the battle of Kunaxa. It seems to me, however, that they do not correctly interpret the words of Xenophon, who does not say that Cyrus ever passed either the Wall of Media, or these four canals _before_ the battle of Kunaxa, but who says (as Krüger, De Authentiâ Anabaseos, p. 12, prefixed to his edition of the Anabasis, rightly explains him), that these four canals flowing from the Tigris are at, or near, the Wall of Media, which the Greeks did not pass through until long _after_ the battle, when Tissaphernes was conducting them towards the Tigris, two days’ march before they reached Sittakê (Anab. ii, 4, 12). It has been supposed, during the last few years, that the direction of the Wall of Media could be verified by actual ruins still subsisting on the spot. Dr. Ross and Captain Lynch (see journal of the Geographical Society, vol. ix. pp. 447-473, with Captain Lynch’s map annexed) discovered a line of embankment which they considered to be the remnant of it. It begins on the western bank of the Tigris, in latitude 34° 3′, and stretches towards the Euphrates in a direction from N. N. E. to S. S. W. “It is a solitary straight single mound, twenty-five long paces thick, with a bastion on its western face at every fifty-five paces; and on the same side it has a deep ditch, twenty-seven paces broad. The wall is here built of the small pebbles of the country, imbedded in cement of lime of great tenacity; it is from thirty-five to forty feet in height, and runs in a straight line as far as the eye can trace it. The Bedouins tell me that it goes in the same straight line to two mounds called Ramelah on the Euphrates, some hours above Felujah; that it is, in places far inland, built of brick, and in some parts worn down to a level with the desert.” (Dr. Ross, l. c. p. 446). Upon the faith of these observations, the supposed wall (now called Sidd Nimrud by the natives) has been laid down as the Wall of Media reaching from the Tigris to the Euphrates, in the best recent maps, especially that of Colonel Chesney; and accepted as such by recent inquirers.