"With the increasing consumption of coal," replied Gideon Spilett, "it can be foreseen that the hundred thousand workmen will soon become two hundred thousand, and that the rate of extraction will be doubled."
"Doubtless, but after the European mines, which will be soon worked more thoroughly with new machines, the American and Australian mines will for a long time yet provide for the consumption in trade."
"For how long a time?" asked the reporter.
"For at least two hundred and fifty or three hundred years."
"That is reassuring for us, but a bad look-out for our great grandchildren!" observed Pencroft.
[WINTER EVENINGS IN GRANITE HOUSE]
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"They will discover something else," said Herbert.
"It is to be hoped so," answered Spilett, "for without coal there would be no machinery, and without machinery there would be no railways, no steamers, no manufactories, nothing of that which is indispensable to modern civilisation!"
"But what will they find?" asked Pencroft. "Can you guess, captain?"