Ten minutes later Stuart was seated at his apparatus, stuffing breakfast food into his mouth and feeling very tired. "Been making this stuff for a hundred and fifty years," he grumbled to himself, chewing doggedly, "and it's still lousy." Suddenly he dropped his spoon and adjusted the view screen controls. Gordon walked in, buttoning up his dungarees and yawning. "Brother," said the chief, "when we get back we're going to sleep for two weeks!" He looked at the busy linguist and was immediately wide awake. "What's up?" Stuart pointed to the screen. "Native just peeked out." He reached over toward one of the cephaloids, mindless brains with tremendous memory and associative power, and began flipping switches. Activating solution flowed through the micro-cellular colloid; little lights on a panel winked on as the surface potentials reached operating level. The linguist glanced briefly at the screen. "I guess there's time to show you one of its little tricks, just to warm it up," he said. He sang, in Universal Speech, a couple of ribald verses of "The Venus of Venus," then touched a switch. Immediately the song came back at him through a little speaker, but in English--and with the unmistakable drawl of Rogers. "I conditioned it a few minutes ago with his voice," explained Stuart. He was delighted with Gordon's reaction of incredulous astonishment. "It's really a wonderful mechanism, Gordon. It--oops! There's a native!" He jabbed hastily at the "Primary Condition" stud, erasing the song and the accent, and switched on the remote control for the picture sequence. He handed Gordon a headset. "Will you monitor the pickup, please? The rest of this stuff will keep me busy." He fell silent, watching the screen. Gordon reached over and switched on the movie camera set up beside him to record the scene. V Three scarlet natives had come out of the cave. They stood in a patch of brilliant sunlight, swinging their middle limbs about and playing with a sassy little monkey-rat as men would with a fox terrier. At length they picked up what seemed to be a crossbow and several spears, slung bundles across their sloping shoulders, and started down the trail. They walked slowly, spears at the ready, and were obviously alert. Frequently they glanced up, or paused as if listening. Rounding a turn, the lead native stopped abruptly, leaped back and dropped flat. The other two dropped almost simultaneously. The leader motioned cautiously for his companions to crawl forward; he pointed with a tentacular upper limb toward the picture sequence machine gleaming in the morning light. On it was showing a picture of a native, enlarged from Stuart's picture of his temporary "prisoner".