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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Underground City by Jules Verne: for he exclaimed in an altered voice, "Father, I should say the gas
was no longer escaping through the cracks!"
"No longer!" cried the old miner--and, pressing his lips tight together,
he snuffed the air several times.
Then, all at once, with a sudden movement, "Hand me
your lamp, Harry," he said.
Ford took the lamp with a trembling hand. He drew off the wire gauze
case which surrounded the wick, and the flame burned in the open air.
As they had expected, there was no explosion, but, what was
more serious, there was not even the slight crackling which
indicates the presence of a small quantity of firedamp.
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