"It's the mountain!" shouted the professor, who had been gazing about,
"it's going to erupt."
From the crater they had explored there were now rolling up great
masses of bright, yellow smoke in sharp contrast to the dark vapors
that had hitherto poured from it. A mighty rumbling and roaring
proceeded from its throat as the smoke poured out, and vivid, blue
flames shot through the sulphurous smother from time to time.
"We've no time to lose," cried Frank, "come on, we must get to the
aeroplane in a hurry."
They all took to their heels over the trembling ground, not stopping
to gaze behind them. The monsters had all disappeared, and as they had
not been seen to re-enter their holes they were assumed to be hiding
at the bottom of the lake.
As the boys gained the aeroplane and clambered in, Frank uttered an
exclamation:
"Where's the professor?"
In a few seconds they espied him carefully bending over the dead body
of one of the slain monsters several yards away.
"Come on, professor," they shouted, "there's no time to lose."
"One second and I have him," the scientist called back.
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