[Transcriber Note: This etext was produced from Imagination Stories of Science and Fantasy January 1953. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] Richard Clark loaded his shotgun. He glanced up the canyon, gray and misty under a cold dawn sky. A cotton-tail darted from a nearby bush and bounced away. Clark's gunsights followed in a weaving line after his bobbing target. Before he could draw a bead, the rabbit vanished behind a dist