The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Underground City by Jules Verne:|
the bottom of the Dochart pit and the open air. As to air,
that came in by the Yarrow shaft, from whence galleries communicated
with another shaft whose orifice opened at a higher level;
the warm air naturally escaped by this species of inverted siphon.
"I will follow you, my lad," said the engineer, signing to the young
man to precede him.
"As you please, Mr. Starr."
"Have you your lamp?"
"Yes, and I only wish it was still the safety lamp, which we formerly
had to use!"
"Sure enough," returned James Starr, "there is no fear of