"How can any one tell how long ago the last
glacial epoch closed?"
"Figure out how far the melting line traveled from south to north,"
said Fenton, "then figure that the glaciers receded at the rate
of only twelve feet every hundred years, and you'll know something
about it."
"Come on!" cried Frank, "let's get in there and find their Croton
system. I'm so thirsty my throat sizzles. Come on!"
Nestor, closely followed by the others, led the way into the south
chamber, called, for convenience, "Chamber B" on the rough map made
later on. The place was damp and cold, and a current of air came
from the southwest corner, indicating an opening there.
After clearing away a heap of rocks and loose sand, which might
once have been rock, the boys found an opening which had been,
apparently, closed for a long period of time. When finally
cleared, after an hour of hard work, the opening from which
the current of air had come was discovered to be a door like
arch in the west wall of the main chamber.
The electric flashlight, however, when introduced into the
opening, showed a narrow passage beyond the opening instead
of a square room. This tunnel-like passage was not far from
six feet in width and about that in height. The walls showed
that it had been cut through solid rock.
The boys listened for some indication of life or motion in the
tunnel, but all was silent. Not even a bird or creeping thing
disturbed the stillness of the place.
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