like a college professor ... and addressed your alleged 'valet' as 'Bud'—"

Rocky did remove his glasses. But this time he did not breathe on them, wipe them, and replace them as was the habit of "Dr. Roswell." Instead, he shoved them out of sight, and grinned at the girl. When he spoke it was in his natural voice.

"All right, Miss Lynn," he said, "you win. I pulled a boner. Now I might as well come clean. I am not Doctor Rockingham Roswell at all. My name is Russell ... Rocky Russell ... and I'm here on Titan to—"

But not at that moment did he tell Lynn Graham who he was, and his purpose on the satellite. For suddenly he paused in midsentence, his jaw dropping open, and his eyes widening to match.

"Lord!" he gasped. "Look ... look at that!"

The others, too, had turned to determine the origin of the rumbling sound. Now they saw it. A tremendous motor-roller trundling down the main thoroughfare of New Boston. A heavy roller bearing a ponderous burden ... a single, gigantic item. The appearance and purpose of this item was unmistakable, but its size....

"Manacles!" croaked Bud. "But ... but who ever heard of manacles that size! That Thing is twenty feet in circumference!"

VI

Humboldt Grossman entered the cavern cautiously. It was dark in there, but not altogether dark. The ever-present luminescence of the chamber walls lent an eerie glow by which could be seen the giant figure huddled at the far end. There had been bonds upon the wrists and ankles of this figure, but now the frayed ends of snapped hawsers dangled loosely as the creature pawed fretfully at adamant walls and ceiling.

At sight of the monster, Grossman faltered, stunned. To the Titanian behind him he choked hoarsely, "He—he still grows!"

"Yes, Master. Already he must crouch to avoid being crushed by the cavern's roof. Each hour he grows faster. In a day ... half a day ... perhaps less ... he will die in here if we do not let him out."

Grossman smiled. It was not a pleasant smile.

"Have no fear. Before that time, he will be outside—under my control!" He stepped forward into the cave. The creature's eyes turned questioningly toward this tiny mote of life which dared approach him thus, stretched forth a hand to crush the 

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