chamber, bordered and cumbered with machines, at which men toiled. Glanfil was presenting him to a Skygor, who made notes with a crayon-like instrument on a board. "New?" he questioned in his ear-dulling roar. "Whence came he? Never stop to answer—show him how to work your machine."

Glanfil led him to a cylindrical appliance against a wall. It had a multitude of levers and push-buttons, and lights shone in its glassed forefront. Most of these were green, but one turned red as they approached. Glanfil pushed a button and turned a lever. The light switched to green again.

"The red means a faulty rhythm somewhere in the light system," explained Glanfil. "Fix it by manipulating the buttons and levers near the red lights—yes, so. It takes not skill, but wary watching."

Planter took over. He found time to observe the rest of the slave-teemed basement.

Some operated a treadmill, others wound at keys or turned cranks. The machines were strange but not mysterious. He judged that they pumped, elevated, and modelled. Glanfil answered his questions:

"'Tis the Skygor method. We supply power by our labors. Springs, levers, such things, are worked."

"Springs and levers?" repeated Planter. "Is this a clockwork town? Why not fuel? Steam?"

Glanfil shook his head. "We men make small fires, but the Skygors not. Their nature is moist, they want such things not. As you say, clockwork is the use of this place."

"If you refuse to do this slave work, what then?"

Glanfil shrugged, and shuddered. "If the sin is not too great, you go to a level below this. Men drag upon a capstan, to wind the mightiest of springs for town works."

"Like rowing in a galley!" Planter summed up wrathfully. "But if the sin is pretty sinful?"

A Skygor overseer came close, saw that Planter had learned the simple machine, and called Glanfil to some other task. Planter worked until such time as a raucous voice bade another shift take over. Marshalled with twenty or more slaves, he was led away to a musty vault, one side of which was lined with cell-like sleeping quarters. Here was a brick oven—perhaps those in the Nest were designed from it—over which two sturdy women toiled at cookery. As the slaves entered, these women quickly passed out stone plates and metal spoons. Into these were poured generous portions of hot, 

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