“Upon my word, this is a very clever hypothesis,” I exclaimed, in spite rather of myself.

“And which Humphry Davy demonstrated to me by a simple experiment. He formed a small ball of the metals which I have named, and which was a very fair representation of our globe; whenever he caused a fine dew of rain to fall upon its surface, it heaved up into little monticules, it became oxidized and formed miniature mountains; a crater broke open at one of its summits; the eruption took place, and communicated to the whole of the ball such a heat that it could not be held in the hand.”

In truth, I was beginning to be shaken by the Professor’s arguments, besides which he gave additional weight to them by his usual ardour and fervent enthusiasm.

“You see, Axel,” he added, “the condition of the terrestrial nucleus has given rise to various hypotheses among geologists; there is no proof at all for this internal heat; my opinion is that there is no such thing, it cannot be; besides we shall see for ourselves, and, like Arne Saknussemm, we shall know exactly what to hold as truth concerning this grand question.”