said.

"Good," the robot said, relieved. "That may be one trouble with my memory. I had to record so many languages before I could temporalize. Sanskrit's very simple, but medieval Russian's confusing, and as for Uighur—however! The purpose of this experiment is to promote the most successful pro-survival relationship between man and his environment. Instant adaptation is what we're aiming at, and we hope to get it by minimizing the differential between individual and environment. In other words, the right reaction at the right time. Understand?"

"Of course not," Martin said. "What nonsense you talk."

"There are," the robot said rather wearily, "only a limited number of character matrices possible, depending first on the arrangement of the genes within the chromosomes, and later upon environmental additions. Since environments tend to repeat—like societies, you know—an organizational pattern isn't hard to lay out, along the Kaldekooz time-scale. You follow me so far?"

"By the Kaldekooz time-scale, yes," Martin said.

"I was always lucid," the robot remarked a little vainly, nourishing a swirl of red ribbon.

"Keep that thing away from me," Martin complained. "Drunk I may be, but I have no intention of sticking my neck out that far."

"Of course you'll do it," the robot said firmly. "Nobody's ever refused yet. And don't bicker with me or you'll get me confused and I'll have to take another jolt of voltage. Then there's no telling how confused I'll be. My memory gives me enough trouble when I temporalize. Time-travel always raises the synaptic delay threshold, but the trouble is it's so variable. That's why I got you mixed up with Ivan at first. But I don't visit him till after I've seen you—I'm running the test chronologically, and nineteen-fifty-two comes before fifteen-seventy, of course."

"It doesn't," Martin said, tilting the glass to his lips. "Not even in Hollywood does nineteen-fifty-two come before fifteen-seventy."

"I'm using the Kaldekooz time-scale," the robot explained. "But really only for convenience. Now do you want the ideal ecological differential or don't you? Because—" Here he flourished the red ribbon again, peered into the helmet, looked narrowly at Martin, and shook his head.

"I'm sorry," the robot said. "I'm afraid this won't work. Your head's too small. Not enough 

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