But you must be a thorough whaleman, to see these sights; and not only that, but if you wish to return to such a sight again, you must be sure and take the exact intersecting latitude and longitude of your first stand-point, else so chance-like are such observations of the hills, that your precise, previous stand-point would require a laborious re-discovery; like the Solomon islands, which still remain incognita, though once high-ruffed Mendanna trod them and old Figuera chronicled them.

The Rocky Mountains formed a vast barrier between them and the United States, and their stern and awful defiles, their rugged valleys, and the great western plains watered by their rivers, remained almost a terra incognita to the American trapper.

He had recognized by certain unmistakable signs, that his fair incognita belonged to the aristocracy.