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“Of all that I have named, Ptolemy, as the latest, possessed the greatest extent of knowledge. Thus, towards the North, his knowledge carries him beyond the Caspian, and he is aware of its being shut in all round like a lake,—a fact which was unknown in the days of Strabo and Pliny, though the Romans were already lords of the world. But though his knowledge extends so far, a tract of 15 degrees beyond that sea he can describe only as Terra Incognita; and towards the South he is fain to apply the same character to all beyond the Equinoxial. In these unknown regions, as regards the South, the first to make discoveries have been the Portuguese captains of our own age; but as regards the Nor...
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