"Is it of that moon that you are speaking,—the moon which turns around us?"
"Certainly, as we have no other moon."
"And it turns as swiftly as you say?"
"Why, yes. And do you know why it turns around us, a prisoner of that earth from which it seeks continually to fly in a straight line? It is because——"
Monsieur Roger stopped suddenly, with an embarrassed air.
"What is the matter?" asked Miette.
"Why, I am afraid I have put myself in a very difficult position."
"Why?"
"I have just undertaken to tell you why the moon does not fall. Is not that true?"