There he beheld a sight that left him breathless. Never before had he seen such an assemblage of scientific apparatus. Its vastness and strangeness were fairly overpowering, even to a man as well versed in physio-chemical paraphernalia as he was.

Before his eyes could take in a tenth part of the spectacle, Cor had led him to the left wall.

"There," he said, "you will observe a development of your heat generator."

Kendrick looked—to see a long bank of large vacuum-tubes, each about three feet high and a foot wide, connected by a central shaft that caused series of little vanes in each of them to revolve at lightning speed.

Around the apparatus moved numerous small attendants, oiling, wiping, adjusting its many delicate parts.

"Well, what do you think now?" asked Cor.

Kendrick made no reply, though he was thinking plenty.

"You see, it is your invention, my dear Professor," the dwarf went on in his taunting voice, "only anteceded by a thousand years—and rather more perfected, you must admit."