The fever of three days of peril and stress is not allayed by one night's rest.
By this time I was high enough to see that the river came out of the ground about fifty feet short of the lip of the gully, and some ten feet beyond where I stood.

Above the hole whence the waters issued was a loose slope of slabs and screes.

It looked an ugly place, but there I must go, for the rock-wall I was on was getting unclimbable.
I turned the corner a foot or two above the water, and stood on a slope of about fifty degrees, running from the parapet of stone to a line beyond which blue sky appeared.

The first step I took the place began to move.

A boulder crashed into the fall, and tore down into the abyss with a shattering thunder.