One of the other Selenites walked a few paces out upon the plank, and turned and looked back at us unconcernedly. The others stood ready to follow after us. Our guide’s expectant figure reappeared. He was returning to see why we had not advanced.

“What is that beyond there?” I asked.

“I can’t see.”

“We can’t cross this at any price,” said I.

“I could not go three steps on it,” said Cavor, “even with my hands free.”

We looked at each other’s drawn faces in blank consternation.

“They can’t know what it is to be giddy!” said Cavor.

“It’s quite impossible for us to walk that plank.”