Three would be better than two; and perhaps Joe might have a plan for
us to get out of this."
Again did the low grumbling sound begin again, and silenced the
conversation between Peg Grant and his cowboy guide, every word of
which had come distinctly to the ears of the crouching saddle boys near
by.
The rumble grew rapidly in volume, until once more the whole great
mountain seemed to tremble. Bob was shivering partly from the
excitement, and because he felt a touch of alarm.
But he could not help noticing the actions of his chum. When the
thunderous roar was about at its height Frank had thrown himself flat
on the ground. Bob could not see what he was doing, but his groping
hand came in contact with the head of his comrade; and he discovered
that it rested on the ground, with one ear pressed to the rock.
Frank was listening!
He knew how the ground carried sounds more distinctly than the air, and
evidently he hoped to discover something concerning the thunder by this
method of wireless telegraphy.
Then, as the volume of sound gradually decreased, just as a lion's roar
dies away, Bob discovered that Peg and Nick were undoubtedly moving
off. He supposed that Nick had made up his mind to hunt for an
outcropping ledge, or some friendly opening, where he could be
sheltered from the storm; and as Peg dared not stay alone, he was
compelled to accompany his guide. The complaining voice of the rich
man's son could be heard for a minute or so.
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