She glanced over her shoulder disdainfully.

"What do you take me for?"

But the secret was not long in becoming general property. Len McGruder, who seemed to prefer devious and furtive ways of accomplishing even obvious things, must have been listening from one of many possible hiding places, or at least observing from a distance, for he produced the steel fragment at the next mealtime gathering.

"What's this about the old ball goin' to pieces?" he demanded. "What're you tryin' to put over?"

Marlin eyed him with distaste. "As far as you are concerned," he said slowly, "nothing. There's only one reason why I denied myself the pleasure of letting you know the fate in store for you—and that's because I knew you were so yellow you'd spill it and frighten the rest."

"Yellow, eh!" McGruder jumped to his feet in a rage. He appealed to the group. "What do you think of this bird—and a couple of others I could mention—" he glanced meaningly at DuChane and Sally—"gettin' their heads together to figger out a way of savin' theirselves while the rest of us is left to rot in this stinkin' blob of mud? How's that for yellow?"

DuChane laughed mirthlessly.

"If there's any comfort in the knowledge," he said, "there'll be no escape for any of us. The mud coating has a faculty of digesting every inert substance it contacts. Very convenient for taking care of our waste products—but unfortunate because it applies also to our habitation."

"You mean it's gonna eat through the shell?" demanded Link, his weasel eyes glittering.

Marlin shrugged.