In addition to this, the perpendicular684 is not correct, supposing it true that Narbonne lies under almost the same parallel as Marseilles, and that this latter place is under the same parallel as Byzantium; which is the opinion of Hipparchus. Now the line drawn across the sea lies under the same parallel as the Strait [of the Pillars] and Rhodes; and the distance from Rhodes to Byzantium, which both lie under the same meridian, is estimated at about 5000 stadia; to which the above-mentioned perpendicular ought to be equal. But since they say that from the recess of the Galatic Gulf, the greatest distance across the sea from Europe to Libya is 5000 stadia, it seems to me that either there is some error in this statement, or that at this point Libya must incline very much to the north, and so come under the same parallel as the Pillars. Polybius is likewise mistaken in telling us that this said perpendicular terminates close to Sardinia; for instead of being close to Sardinia, it is far west thereof, having almost the whole of the sea of Liguria685 between it and that island. Besides this he makes the length of the sea-coast too great; but this [error] is not so considerable [as the two preceding].
4. After this Polybius proceeds to set right the mistakes of Eratosthenes. In this he is sometimes successful; at others his corrections are for the worse. For example, Eratosthenes gives 300 stadia from Ithaca to Corcyra; Polybius makes it above 900. From Epidamnus to Thessalonica Eratosthenes allows 900 stadia; Polybius says above 2000. In these instances he is correct. But where Eratosthenes states that from Marseilles to the Pillars there are 7000 stadia, and from the Pyrenees [to the same place] 6000, and Polybius alters this to more than 9000 from Marseilles, and little less than 8000 from the Pyrenees,686 he is quite mistaken, and not so near to the truth as Eratosthenes. For all are now agreed that, barring the indirectness of the roads, the whole length of Iberia is not more than 6000 stadia687 from the Pyrenees to its western limits; notwithstanding Polybius gives 8000 stadia for the length of the river Tagus, from its source to its outlets, and this in a straight line without any reference to its sinuosities, which in fact never enter into the geographical estimate, although the sources of the Tagus are above 1000 stadia from the Pyrenees. His remark is quite correct, that Eratosthenes knew little about Iberia, and on this account sometimes makes conflicting statements concerning it. He tells us, for example, that the portion of this country situated on the sea-coast as far as Gades is inhabited by Galatæ,688 who possess western Europe as far as Gades; nevertheless, in his account of Iberia he seems quite to have forgotten this, and makes no mention of these Galatæ whatever.
5. Again, however, Polybius makes an incorrect assertion, in stating that the whole length of Europe is unequal to that of Africa and Asia taken together. He tells us “that the entrance at the Pillars corresponds in direction to the equinoctial west, and that the Don flows from the summer rising, consequently the length of Europe is less than that of Asia and Africa taken together by the space between the summer rising689 and the equinoctial rising,690 since Asia occupies the eastern portion of the northern semicircle. Now, in addition to the obscurity which Polybius throws over subjects which might have been simply stated, it is false that the river Don flows from the summer rising. For all who are acquainted with these localities inform us that this river flows from the north into the Mæotis, so that the mouth of the river lies under the same meridian as that of the Mæotis; and so in fact does the whole river as far as is known.691
6. Equally unworthy of credit is the statement of those who tell us, that the Don rises in the vicinity of the Danube, and flows from the west; they do not remember that between these are the Dniester, the Dnieper, and the Bog, all great rivers, which flow [into the Euxine Sea]; one runs parallel to the Danube, the other two to the Don. Now if at the present day we are ignorant of the sources both of the Dniester, and also of the Dnieper and Bog, the regions farther north must certainly be still less known. It is therefore a fictitious and idle assertion, that the Don crosses these rivers, and then turns northward on its way to discharge itself into the Mæotis, it being well known that the outlets to this river are in the most northern and eastern portions of the lake.692
No less idle is the statement which has also been advanced, that the Don, after crossing the Caucasus, flows northward, and then turns towards the Mæotis.693 No one, however, [with the exception of Polybius,] made this river flow from the east. If such were its course, our best geographers would never have told us that its direction was contrary to that of the Nile, and, so to speak, diametrically opposite thereto, as if the course of both rivers lay under the same meridian.
7. Further, the length of the inhabited earth is measured on a line parallel with the equator, as it is in this direction that its greatest length lies: in the same way with respect to each of the continents, we must take their length as it lies between two meridians. The measure of these lengths consists of a certain number of stadia, which we obtain either by going over the places themselves, or roads or ways parallel thereto. Polybius abandons this method, and adopts the new way of taking the segment of the northern semicircle comprised between the summer rising and the equinoctial rising. But no one ought to calculate by variable rules or measures in determining the length of fixed distances: nor yet should he make use of the phenomena of the heavens, which appear different when observed from different points, for distances which have their length determined by themselves and remain unchanged. The length of a country never varies, but depends upon itself; whereas, the equinoctial rising and setting, and the summer and winter rising and setting, depend not on themselves, but on our position [with respect to them]. As we shift from place to place, the equinoctial rising and setting, and the winter and summer rising and setting, shift with us; but the length of a continent always remains the same. To make the Don and the Nile the bounds of these continents, is nothing out of the way, but it is something strange to employ for this purpose the equinoctial rising and the summer rising.
8. Of the many promontories formed by Europe, a better description is given by Polybius than by Eratosthenes; but even his is not sufficient. Eratosthenes only names three; one at the Pillars of Hercules, where Iberia is situated; a second at the Strait of Sicily, and containing Italy; the third terminated by the Cape of Malea,694 comprising all the countries situated between the Adriatic, the Euxine, and the Don. The two former of these Polybius describes in the same manner as Eratosthenes, but the third, which is equally terminated by the Cape of Malea695 and Cape Sunium,696 [he makes to] comprehend the whole of Greece, Illyria, and some portion of Thrace. [He supposes] a fourth, containing the Thracian Chersonesus and the countries contiguous to the Strait,697 betwixt Sestos and Abydos. This is occupied by the Thracians. Also a fifth, about the Kimmerian Bosphorus and the mouth of the Mæotis. Let us allow [to Polybius] his two former [promontories], they are clearly distinguished by unmistakeable bays; the first by the bay between Calpé698 and the Sacred Promontory699 where Gades700 is situated, as also by the sea between the Pillars and Sicily; the second701 by the latter sea and the Adriatic,702 although it may be objected that the extremity of Iapygia,703 being a promontory in itself, causes Italy to have a double cape. But as for the remaining [promontories of Polybius], they are plainly much more irregular, and composed of many parts, and require some other division. So likewise his plan of dividing [Europe] into six parts, similar to that of the promontories, is liable to objection.
However, we will set to rights each of these errors separately, as we meet with them, as well as the other blunders into which he has fallen in his description of Europe, and the journey round Africa. For the present we think that we have sufficiently dwelt on those of our predecessors whom we have thought proper to introduce as testimonies in our behalf, that both in the matter of correction and addition we had ample cause to undertake the present work.
CHAPTER V.