elation to my marriage with my
pretty little cousin.

About twelve o'clock there was a great and sudden change in the aspect
of the rocky sides of the gallery. I first noticed it from the
diminution of the rays of light which cast back the reflection of the
lamp. From being coated with shining and resplendent lava, it became
living rock. The sides were sloping walls, which sometimes became quite
vertical.

We were now in what the geological professors call a state of
transition, in the period of Silurian stones, so called because this
specimen of early formation is very common in England in the counties
formerly inhabited by the Celtic nation known as Silures.

"I can see clearly now," I cried; "the sediment from the waters which
once covered the whole earth formed during the second period of its
existence these schists and these calcareous rocks. We are turning our
backs on the granite rocks, and are like people from Hamburg who would
go to Lubeck by way of Hanover."

I might just as well have kept my observations to myself. My geological
enthusiasm got the better, however, of my cooler judgment, and Professor
Hardwigg heard my observations.

"What is the matter now?" he said, in a tone of great gravity.

"Well," cried I, "do you not see these different layers of calcareous
rocks and the first indication of slate strata?"

"Well; what then?"

"We have arrived at that period of the world's existence when the first
plants and the first animals made their appearance."

"You think so?"

"Yes, look; examine and judge for yourself."

I induced the Professor with some difficulty to cast the light of his
lamp on the sides of the long winding gallery. I expected some
exclamation to burst from his lips. I was very much mistaken. The worthy
Professor never spoke a word.

It was impossible to say whether he understood me or not. Perhaps it was
possible that in his pride--my uncle and a learned professor--he did not
like to own that he was wrong in having chosen the eastern tunnel, or
was he determined at any price to go to the end of it? It was quite
evident we had left the region of lava, and that the road by which we
were going could not take us back to the great crater of Mount Sneffels.

As we went along I could not help ruminating on the whole question, and
asked myself if I did not lay too great a stress on these sudden and
peculiar modifications of the earth's crust.

After all, I was very likely to be mis