“Forward! forward!” I cried.

I was already darting down the gloomy tunnel when the Professor stopped me; he, the man of impulse, counselled patience and coolness.

“Let us first return to Hans,” he said, “and bring the raft to this spot.”

I obeyed, not without dissatisfaction, and passed out rapidly among the rocks on the shore.

I said: “Uncle, do you know it seems to me that circumstances have wonderfully befriended us hitherto?”

“You think so, Axel?”