The measure adopted by Strabo was the stadium. In book vii. chap. vii. § 4, he says, From Apollonia to Macedonia is the Egnatian Way; its direction is towards the east, and the distance is measured by pillars at every mile, as far as Cypsela and the river Hebrus. The whole distance is 535 miles. But reckoning, as the generality of persons do, a mile at eight stadia, there may be 4280 stadia. And, according to Polybius, who adds two plethra, which are a third of a stadium, to every eight stadia we must add 178 stadia more,—a third part of the number of miles. In book xi. chap. xi. § 5, he compares the parasang with the stadium, and states that some writers reckoned it at 60, others at 40, and others at 30 stadia. Dr. Smith, in his Dictionary of Greek and Roman Antiquities, says, We think that Ukert has satisfactorily shown an accurate description of a place should be particular to add its astronomical and geometrical relations, explaining care fully its extent, distance, degrees of latitude, and temperature of atmosphere. He says likewise, as the size of the earth has been demonstrated by other writers, we shall take for granted that the Greeks had not different standards of length, but always used the Olympic stadium and the foot corresponding to it. He states that the stadium was equal to 600 Greek, or 625 Roman feet, or to 125 Roman paces, and the Roman mile contained 8 stadia. Hence the stadium contained 606 feet 9 inches, English. This standard prevailed throughout Greece under the name of the Olympic stadium, because it was the exact length of the stadium or foot-race course at Olympia, measured between the pillars at the two extremities of the course. Still Dr. Smith further observes, But although the stadium and the foot connected with it were single definite measures throughout Greece, yet we find in the eastern countries, Babylon, Syria, and Egypt, and in some neighboring Greek states, feet longer than the Olympic, the origin of which is to be explained by the coëxistence, in the Babylonian system, of a royal or sacred and a common foot and cubit, which were so related to one another, that the royal cubit was three finger-breadths longer than the common. We may conclude that Strabo’s stadium varied considerably, as he sometimes received his distance from personal observation or credible report, and often quoted other writers, and reduced other standards, as the mile, the parasang, and the schoenus, to the stadium. In addition to this, the most ancient mode of reckoning distances was by the number of days required to perform the journey, and this was transferred into stadia by reckoning a certain number of stadia to a day’s journey. Herodotus iv. 85, 86.