Further, Homer had conceived the existence of what we may call ultra-terrene parts, both westwards and eastwards. On the one hand, Menelaus, after death, is to be carried to the Elysian plain, where Zephyrs continually blow, springing fresh from the bed of western Ocean. On the other hand, the groves of Persephone are on the beach of Ocean, but in the furthest East.
Still it does not at all follow from this, that he had in his mind the idea of a double egress from the Mediterranean, or, the θάλασσα at large, to the Ocean. On the contrary, we never hear of any mode of access to it except one; and his placing the point where Ulysses enters it amidst mist and cloud, and his calling in the aid of Boreas to carry the ship to the groves of Persephone and mouth of the Shades (which he probably intended to be the exact counterpart in position of the Elysian plain), lead to the belief that his egress from sea to Ocean was in the north, and that the further route to the Shades lay, for the most part, in a southerly direction.
Open-sea Passage to Ocean-mouth.
The reader of the Odyssey will observe, that Ulysses encounters on his passage tempests indeed, but yet nothing in the nature of a dangerous maritime passage, before he has entered the Ocean-river, and then, completing his excursion to the nether world, has returned to the island of Circe[587]. Therefore we may say with certainty, that the mouth of Oceanus is, according to the ideas of Homer, accessible by the broad and open sea. Thus we have attained a first condition for the determination of its site.
But, before he sets out a second time from Ææa, Circe, now his friend, directs him as to his onward and homeward course. First, he was to reach the island of the Sirens[588]. After passing beyond this, the deity no longer lays before him a single and continuous route[589]: but indicates to him two alternatives, each involving a most dangerous passage. The first is described in the lines Od. xii. 59-72, beginning ἔνθεν μὲν γάρ. The second, which she recommends in vv. 73-110, begins with οἱ δὲ δύω σκόπελοι: where the δὲ is the apodosis to the μὲν of v. 59. Now, it must be remembered, that physically there was nothing to prevent his returning by the way he came, and thus avoiding both of these passages. Why then does Homer expose him to such extraordinary danger, leaving him no option but either total destruction, or the certain loss, at the least, of six men of his crew[590]?
The voyage of Ulysses might have been given us by the Poet as the execution of a divine plan, comprehensively premeditated as a whole: but it is not so: it is shown us as simply prolonged from time to time by some error of his own or of his companions, or by the spite of Neptune, or by the vengeance which the Sun demanded and obtained[591]. At Ææa he has nothing to do, but to take the best way home. Tiresias had indeed prophesied that he would come to Thrinacie[592], but nowhere intimates that he was to be divinely compelled to do this, or that he would take that route for any other reason than according to his own best judgment. Why then does he not return, as he had come, by the open sea, instead of tempting either of the two passages of peril?
The answer I believe to be this. He was subject to the resentment of Neptune, who operates by storm in the open sea. Otium divos rogat in patenti prensus Ægæo. As in the heroic age, every wound, generally speaking, is death, so storm either invariably or commonly means foundering or shipwreck. Thus then Ulysses might prudently keep to landlocked waters and narrow seas, even with a crisis of great danger before him, rather than face the angry Sea-god on the long passages over the open main, by which he had come to the land of the Cyclops, and so onwards to Ææa.
Rationalized, and reduced to its simplest form, this seems to imply that the routes pointed out to him by Circe, and perhaps especially that which he was to prefer, were short cuts either to his home, or at least back into the Inner or Greek world. And in conformity with this supposition, the whole prediction of Circe appears to presume that a passage of moderate length would bring him back within the known world; for it never speaks of the breadth of any unknown sea to be crossed, which to the navigators of that day was always its most formidable feature.
In the mental view of Homer, then, the passage of Scylla could not lie much beyond the horizon of his own Greek world and of geography proper. This was the more eligible of the two routes. The other was that of the Πλαγκταὶ, or Bosphorus. It was rejected as involving certain destruction: for only Jason had safely passed it by the aid of Juno, and Pallas was not now at hand to succour Ulysses; since he was outside that Greek world, to which her action has been restricted, generally speaking, and in all likelihood for poetical reasons, in the Odyssey. Now, since both these passages are spoken of as apparently lying near the island of the Sirens, which is itself separated, as far as we can judge, by no long interval from Ææa and Circe, the next inferences we have to draw are two of very great importance. The first is, that although the one strait of Homer physically corresponds with the Straits of Messina, while by the other he plainly means the Bosphorus, yet he conceived of these as within no great distance of one another. The second inference is that, according to the belief of Homer, the waters beyond the Bosphorus were accessible by some channel other than that of the Dardanelles and Sea of Marmora: for otherwise Ulysses could not have placed himself on the farther side of those terrible narrows, except by navigating one of them.