How the rest of that night went by, I can hardly tell.  We seemed to be for hours and hours without end tacking to and fro, now going up the river two or three miles, then dropping down with the tide, and always zig-zagging so as to cover as much ground as possible.  The night lengthened as if it would never end; but, like all tedious times of the kind, it dragged its weary course by, till, to my utter astonishment, when it did come, a faint light dawned away over the sea beyond the mouth of the river, just when we were about a mile below the city.