Mark's first impulse was to hasten back and call the two professors,
but he looked over the desolate landscape, and could not see them, and
he feared that if he went away Jack might slip and fall into the
unknown depths of the crater.
"I've got to get him out alone," decided Mark. "But how can I do it?"
He crawled cautiously nearer to the edge of the extinct volcano and
looked down. A few loose stones, dislodged by his weight, rattled down
the sides.
"Look out!" cried Jack quickly, "or you'll fall, too!"
"I'll be careful," answered Mark, and then he drew away out of danger,
with a queer feeling about his heart, which was beating furiously. Mark
had hoped to be able to make his way down the side of the crater to
where his chum was and help him up. But a look at the steep sides and
the uncertain footing afforded by the loose rocks of lava-like
formation showed that this could not be done.
"I've got to think of a different scheme," decided Mark, and, spurred
on by the necessity of acting quickly if he was to save Jack, he fairly
forced his brain to work.
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