“Poor man!” said Herbert, who had rushed to the door, but returned, having seen Ayrton slide down the rope on the lift and disappear in the darkness.

“He will come back,” said Cyrus Harding.

“Come, now, captain,” exclaimed Pencroft, “what does that mean? What! wasn’t it Ayrton who threw that bottle into the sea? Who was it then?”

Certainly, if ever a question was necessary to be made, it was that one!

“It was he,” answered Neb, “only the unhappy man was half-mad.”

“Yes!” said Herbert, “and he was no longer conscious of what he was doing.”

“It can only be explained