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The assertion of thrice, instead of twice, is either an error of the author, or a blunder of the scribe, but the phenomenon is the same, and the expression soft-flowing,21 has reference to the flood-tide, which has a gentle swell, and does not flow with a full rush. Posidonius believes that where Homer describes the rocks as at one time covered with the waves, and at another left bare, and when he compares the ocean to a river, he alludes to the flow of the ocean. The first supposition is correct, but for the second there is no ground; inasmuch as there can be no comparison between the flow, much less the ebb of the sea, and the current of a river. There is more probability in the explanation of Crates, that Homer describes the whole ocean as deep-flowing, ebbing, and also calls it a river, and that he also describes a part of the ocean as a river, and the flow of a river; and that he is speaking of a part, and not the whole, when he thus writes:—

He does not, however, mean the whole, but the flow of the river in the ocean, which forms but a part of the ocean. Crates says, he speaks of an estuary or gulf, extending from the winter tropic towards the south pole.23 Now any one quitting this, might still be in the ocean; but for a person to leave the whole and still to be in the whole, is an impossibility. But Homer says, that leaving the flow of the river, the ship entered on the waves of the sea, which is the same as the ocean. If you take it otherwise you make him say, that departing from the ocean he came to the ocean. But this requires further discussion.

8. Perception and experience alike inform us, that the earth we inhabit is an island: since wherever men have approached the termination of the land, the sea, which we designate ocean, has been met with: and reason assures us of the similarity of those places which our senses have not been permitted to survey. For in the east24 the land occupied by the Indians, and in the west by the Iberians and Maurusians,25 is wholly encompassed [by water], and so is the greater part on the south26 and north.27 And as to what remains as yet unexplored by us, because navigators, sailing from opposite points, have not hitherto fallen in with each other, it is not much, as any one may see who will compare the distances between those places with which we are already acquainted. Nor is it likely that the Atlantic Ocean is divided into two seas by narrow isthmuses so placed as to prevent circumnavigation: how much more probable that it is confluent and uninterrupted! Those who have returned from an attempt to circumnavigate the earth, do not say they have been prevented from continuing their voyage by any opposing continent, for the sea remained perfectly open, but through want of resolution, and the scarcity of provision. This theory too accords better with the ebb and flow of the ocean, for the phenomenon, both in the increase and diminution, is every where identical, or at all events has but little difference, as if produced by the agitation of one sea, and resulting from one cause.

9. We must not credit Hipparchus, who combats this opinion, denying that the ocean is every where similarly affected; or that even if it were, it would not follow that the Atlantic flowed in a circle, and thus continually returned into itself. Seleucus, the Babylonian, is his authority for this assertion. For a further investigation of the ocean and its tides we refer to Posidonius and Athenodorus, who have fully discussed this subject: we will now only remark that this view agrees better with the uniformity of the phenomenon; and that the greater the amount of moisture surrounding the earth, the easier would the heavenly bodies be supplied with vapours from thence.

10. Homer, besides the boundaries of the earth, which he fully describes, was likewise well acquainted with the Mediterranean. Starting from the Pillars,28 this sea is encompassed by Libya, Egypt, and Phœnicia, then by the coasts opposite Cyprus, the Solymi,29 Lycia, and Caria, and then by the shore which stretches between Mycale30 and Troas, and the adjacent islands, every one of which he mentions, as well as those of the Propontis31 and the Euxine, as far as Colchis, and the locality of Jason’s expedition. Furthermore, he was acquainted with the Cimmerian Bosphorus,32 having known the Cimmerians,33 and that not merely by name, but as being familiar with themselves. About his time, or a little before, they had ravaged the whole country, from the Bosphorus to Ionia. Their climate he characterizes as dismal, in the following lines:—