Once Mona turned her eyes searching to the right and
left; whereupon Billie was still further mystified to see that,
although the cleft was fifty or sixty miles in length, yet its
extreme ends seemed entirely open to the world. Nothing but a deep
"V" of blue sky was to be seen in either direction.
The sun disappeared altogether. Always the two walls grew closer and
closer together, until at last Billie could see, despite the
semidarkness, a heavy growth of vegetation on the opposite wall.
Beneath her, as well, the surface was densely wooded.
Still they descended! It was unbelievable; surely the chasm did not
extend right into the heart of the globe. They had been flying for
hours!
At last came a time when the far wall of the cleft was so near that
Billie could have shot a deer upon it. She estimated the distance at
two hundred yards; and then, and not until then, did she realize
that Mona, in order to inspect this bank, was now LOOKING up. The
wall which had seemed right ahead, all along, was now actually
overhead!
Were they entering some sort of a cave? If so, it had dimensions
that staggered the imagination.
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