The moments passed, and death delayed to come. The awful plunge was still put off; and though I remained on my knees and waited long, still the end came not. The waters seemed still, the boat motionless. It was borne upon the surface of a vast stream as smooth as glass; but who could tell how deep that stream was, or how wide? At length I rose from my knees and sank down upon the seat of the boat, and tried to peer through the gloom. In vain. Nothing was visible. It was the very blackness of darkness. I listened, but heard nothing save a deep, dull, droning sound, which seemed to fill all the air and make it all tremulous with its vibrations. I tried to collect my thoughts. I recalled that old theory which had been in my mind before this, and which I had mentioned to Agnew. This was the notion that at each pole there is a vast opening; that into one of them all the waters of the ocean pour themselves, and, after passing through the earth, come out at the other pole, to pass about its surface in innumerable streams. It was a wild fancy, which I had laughed at under other circumstances, but which now occurred to me once more, when I was overwhelmed with despair, and my mind was weakened by the horrors which I had experienced; and I had a vague fear that I had been drawn into the very channel through which the ocean waters flowed in their course to that terrific, that unparalleled abyss. Still, there was as yet no sign whatever of anything like a descent, for the boat was on even keel, and perfectly level as before, and it was impossible for me to tell whether I was moving swiftly or slowly, or standing perfectly still; for in that darkness there were no visible objects by which I could find out the rate of my progress; and as those who go up in balloons are utterly insensible of motion, so was I on those calm but swift waters.