"Jump!" he cried, and flung himself forward to block the attack with his out-thrust right hand.

An instant later the Gila monster snapped its gaping jaws together on the fleshy edge of Lennon's palm. It whirled over upon its back. Caught outstretched and almost prone upon the ground, Lennon sought to wrench his hand free and draw away. The heavy lizard was dragged along with its crooked legs futilely clawing the air. But its powerful jaws remained clenched on the hand with bulldog tenacity.

A voice shrilled in Lennon's ear: "Hold still! Hold still!"

Carmena stooped over the writhing monster to thrust the muzzle of a small revolver against the side of its lower jaw. The bullet shattered the jaw and blew it half off. A vigorous kick hurled the now harmless reptile aside.

Lennon had started to raise himself to a sitting position. Carmena flung herself upon her knees and caught up his torn hand to her red lips. She sucked hard at the wounds——

With the suddenness of a dropped veil, the hot, white glare of the desert noon went black before Lennon's eyes. He sank down upon the sand, unconscious.

When the light of returning life glimmered back into his brain, he first was dimly aware of a pale Madonna face that appeared to hover close above him. His clearing gaze gradually made out the girl's features. There was no colour even in her lips. Her eyes were wide with grief and dread.

She saw the dawning consciousness in his eyes.

"Jack!" she whispered—"Jack!—You haven't left me—you won't leave me!"

"Who—what's the matter?—— Oh, that——"