The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Underground City by Jules Verne:|
During long years he zealously performed his duty.
His only grief had been to perceive the bed becoming impoverished,
and to see the hour approaching when the seam would be exhausted.
It was then he devoted himself to the search for new veins
in all the Aberfoyle pits, which communicated underground
one with another. He had had the good luck to
discover several during the last period of the working.
His miner's instinct assisted him marvelously, and the engineer,
James Starr, appreciated him highly. It might be said that
he divined the course of seams in the depths of the coal mine
as a hydroscope reveals springs in the bowels of the earth.