And yet, strange to say, neither of the two boys jumped quickly to
their feet in wild dismay, seeking to prepare for the rain that might
soon burst upon them. On the contrary they continued to sit there,
straining their ears to catch the rumbling reverberations that kept
coming, with little respites between.
"Say, now, what d'ye think of that, Bob?" asked Frank, when silence
again held sway for a brief period. "Nary a cloud as big as your hand
in the sky; and yet all that grumbling oozing out of old Thunder
Mountain! Looks like we might have the biggest job of our lives
finding out the secret of that pile of rocks. There she starts in
again, harder than ever. Listen, Bob, for all you're worth!"
CHAPTER VI
A SECOND ALARM
"It's stopped again!" remarked Bob, after possibly five minutes had
passed, during which time the ominous rumbling, accompanied by earth
tremors, had kept up, now rising to a furious stage, and then almost
dying away.
Frank gave a big sigh.
"It sure has," he admitted; "and I don't wonder now, after I've heard
the racket with my own ears, that the reds for a hundred years back
have always declared the Great Manitou lived in Thunder Mountain, and
every little while let them hear his awful voice."
"Then this thing has been going on forever, has it?" asked Bob.
"The Navajos say so; though even they admit that, of late, it's got a
brand new kink to the growl," Frank answered.
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