Captain Webber rubbed the back of his hand along his cheek.

"You realize, of course, that that is impossible?"

"Yes sir."

"Send Mr. Friden in to see me, at once."

The young man saluted and rushed out of the room. He returned with a somewhat older man who wore spectacles and frowned.

"Now then," said Captain Webber, "what's all this Lieutenant Peterson tells me about a city? Are you enjoying a private little joke, Friden?"

Mr. Friden shook his head emphatically. "No sir."

"Then perhaps you'd like to explain."

"Well, sir, you see, I was getting bored and just for something to do, I thought I'd look through the screen—not that I dreamed of seeing anything. The instruments weren't adjusted, either; but there was something funny, something I couldn't make out exactly."

"Go on," said Captain Webber, patiently.