At the foot of one of the largest of these rocks we came across a large hole descending almost perpendicularly into the earth.
"We lit our lamps and descended.

After some scrambling we found ourselves on a landing-place, from which another low passage of an easier gradient led into a large cave in the solid rock.
"The surface underneath our feet was covered with a dust so fine that it slipped from beneath us like sand, and rose in thick clouds about us.
The cave was high enough to walk upright in, and seemed to run a great distance, with many lateral passages and smaller recesses off the principal chamber.

Moynglass entered one of these passages and disappeared from view.

A few moments afterwards we heard him, in a very excited voice, calling us to follow him.
"We proceeded stooping, in Indian file, down the passage, and found Moynglass in a smaller cave at the end of it, staring intently at something which was at first difficult to see in the gloom.

Then, by the light of our lamps, we made out a sapling sticking up between two rocks, with a withered human hand impaled on it by a rusty sheath knife.
"As I was examining it, one of my companions, who had been exploring the cave, gave a cry of astonishment which caused me to look round.