What could be the meaning of such a change? Up to this time facts had supported the theories of Davy and of Liedenbrock; until now particular conditions of nonconducting rocks, electricity and magnetism, had tempered the laws of nature, giving us only a moderately warm climate, for the theory of a central fire remained in my estimation the only one that was true and explicable. Were we then turning back to where the phenomena of central heat ruled in all their rigour and would reduce the most refractory rocks to the state of a molten liquid? I feared this, and said to the Professor:

“If we are neither drowned, nor shattered to pieces, nor starved to death, there is still the chance that we may be burned alive and reduced to ashes.”

At this he shrugged his shoulders and returned to his thoughts.

Another hour passed, and, except some slight increase in the temperature, nothing new had happened.

“Come,” said he, “we must determine upon something.”