What was more, if it were a cave,
how could the mind of man account for vegetation on its roof?
Within a few minutes Fort called from his machine; whereupon Mona
located a landing-place, a small clearing dimly visible in the
distance. The opposite wall of the chasm--or the roof of the cave,
whichever it was--now approached to within five yards of the tops of
the two machines. Mona and the athlete stepped out, and looked
around.
Billie's senses swam. This clearing, as has been said, was only a
few yards away from the tops of the bushes on the roof. Moreover,
all this vegetation, instead of growing at right angles from the
surface in the usual way, was all lying flat against the soil, and
all pointing in one direction--back, the way they had come!
The sky was not overhead any longer; it was a mere strip of very
dark blue, lying far off on the horizon. That is, to the right; on
the left, the cavelike cleft extended still further, its limits
shrouded in darkness.
"Queer, isn't it?" laughed Fort.
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