But the boldness and maturity of navigation may be measured pretty nearly by the length of its voyages. The geographical particulars of the Wanderings, however dislocated and distorted, show us that the people who had supplied them had acquired a considerable acquaintance with all the waters within, and probably also, nay, I should be disposed to say certainly, some that were without, the Straits of Gibraltar. But in all the poems of Homer we find the traces of Greek knowledge and resort become fainter and fainter, as we pass beyond certain points. On the Greek Peninsula, to the south of the Ambracian gulf on the west and of Mount Olympus on the east, we have the signs of a constant intercourse to and fro. The same tokens extend to the islands immediately surrounding it, and reaching at least as far as Crete. Indeed, apart from particular signs, we may say that, without familiar and frequent intercourse among the members that composed it, the empire of Agamemnon could not have subsisted. But, at certain distances, the mode of geographical handling becomes faint, mistrustful, and indistinct. Distances are misstated, or cease to be stated at all. The names of countries are massed together in such a way as to show that the Poet had no idea of a particular mode of juxtaposition for them. Topographical or local features, of a character such as to identify a description with some particular place or region as its prototype in nature, are erroneously transposed to some situation which, from general indications, we can see must be upon a different and perhaps distant part of the surface of the globe. Again, by ceasing to define distances and directions, he shows from time to time that he has lost confidence in his own collocation, that he is not willing to challenge a comparison with actual nature, and that, from want of accurate knowledge, he feels he must seek some degree of shelter in generalities. It is obvious that, under the circumstances as they have thus far been delineated, the geography of the poems, with a centre fixed for it somewhere in Greece, say at Olympus or Mycenæ, might be first of all divided into three zones, ranging around that centre. The first and innermost would be that of the familiar knowledge and experience of his countrymen. The second would be that of their rare and occasional resort. The third would be a region wholly unknown to them, and with respect to which they were wholly dependent on foreign, that is on Phœnician, report; much as a Roman, five hundred years ago, would practically depend upon the reports of Venetians and Genoese mariners for all or nearly all his ultra-marine knowledge.