class="dcap">"Upt!" Ont exclaimed, exasperated. "Why don't you answer me, Upt? Upt! Where are you, Upt? Why don't you answer?"

"There you are," Gordon said, smiling, as he handed Harold the head of cauliflower.

"Thanks," Harold said, accepting the white, fresh head, and balancing it in his palm.

The two men continued up the walk to the house.

"As I was saying," Gordon took up their conversation, "when men get to Mars, if they aren't careful they may destroy a civilization, or even thousands of intelligent beings, without knowing it...."

THE END

Transcriber's Note:

This etext was produced from Amazing Stories December 1948. 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.