"So then, father, all the An-vils flew away from Earth?" "Not all. There were two child An-vils, one male and one female, aged two years, who had been born on Earth, and they started off with all the other An-vils and flew up into the sky. But when they reached the upper limits of the strato-sphere, they hesitated, turned tail and fluttered back to Earth where they had been born. Their names were Zizzo and Zizza." "And what happened to Zizzo and Zizza, papa?" "Well, like all the An-vils, they were great mathematicians. So, they multiplied." "Oh, papa," laughed Zoe, flapping her wings excitedly, "that was a very nice story!" Transcriber's Note: This etext was produced from _Amazing Stories_ Oct.-Nov. 1953. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed. Minor spelling and typographical errors have been corrected without note.