narrow that in the blackness I was constantly bumping first one
rock wall and then another as the river wound hither and thither
along its flinty bed.

Far ahead I presently heard a deep and sullen roar which increased
in volume as I advanced, and then broke upon my ears with all the
intensity of its mad fury as I swung round a sharp curve into a
dimly lighted stretch of water.

Directly before me the river thundered down from above in a mighty
waterfall that filled the narrow gorge from side to side, rising
far above me several hundred feet--as magnificent a spectacle as
I ever had seen.

But the roar--the awful, deafening roar of those tumbling waters
penned in the rocky, subterranean vault! Had the fall not entirely
blocked my further passage and shown me that I had followed the
wrong course I believe that I should have fled anyway before the
maddening tumult.

Thurid and the therns could not have come this way. By stumbling
upon the wrong course I had lost the trail, and they had gained so
much ahead of me that now I might not be able to find them before
it was too late, if, in fact, I could find them at all.

It had taken several hours to force my way up to the falls against
the strong current, and other hours would be required for the
descent, although the pace would be much swifter.

With a sigh I turned the prow of my craft down stream, and with