Bastin snored away contentedly, quite unaffected by his escape which to him was merely an incident in the day's work; and so, too, slumbered Bickley, except that he did not snore.

But the amazement and the mystery of all that we had discovered and of all that might be left for us to discover, held me back from sleep.
What did it mean?
What could it mean?
My nerves were taut as harp strings and seemed to vibrate to the touch of invisible fingers, although I could not interpret the music that they made.

Once or twice also I thought I heard actual music with my physical ears, and that of a strange quality.

Soft and low and dreamful, it appeared to well from the recesses of the vast cave, a wailing song in an unknown tongue from the lips of women, or of a woman, multiplied mysteriously by echoes.

This, however, must have been pure fancy, since there was no singer there.
Presently I dozed off, to be awakened by the sudden sound of a great fish leaping in the lake.