"Disraeli would never have got into such a situation in the first place," the robot said unhelpfully. "The ecologizer can give you the ideal ecological differential, but only for your own type, because otherwise it wouldn't be your optimum. Disraeli would have been a failure in Russia in Ivan's time." "Would you mind clarifying that?" Martin asked thoughtfully. "Certainly," the robot said with great rapidity. "It all depends on the threshold-response-time of the memory-circuits in the brain, if you assume the identity of the basic chromosome-pattern. The strength of neuronic activation varies in inverse proportion to the quantative memory factor. Only actual experience could give you Disraeli's memories, but your reactivity-thresholds have been altered until perception and emotional-indices approximate the Disraeli ratio." "Oh," Martin said. "But how would _you_, say, assert yourself against a medieval steam-shovel?" "By plugging my demountable brain into a larger steam-shovel," ENIAC told him. * * * * * Martin seemed pensive. His hand rose, adjusting an invisible monocle, while a look of perceptive imagination suddenly crossed his face. "You mentioned Russia in Ivan's time," he said. "Which Ivan would that be? Not, by any chance--?" "Ivan the Fourth. Very well adjusted to his environment he was, too. However, enough of this chit-chat. Obviously you'll be one of the failures in our experiment, but our aim is to strike an average, so if you'll put the ecologizer on your--" "That was Ivan the Terrible, wasn't it?" Martin interrupted. "Look here, could you impress the character-matrix of Ivan the Terrible on my brain?" "That wouldn't help you a bit," the robot said. "Besides, it's not the purpose of the experiment. Now--" "One moment. Disraeli can't cope with a medievalist like St. Cyr on his own level, but if I had Ivan the Terrible's reactive thresholds, I'll bet I could throw a bluff that might do the trick. Even though St. Cyr's bigger than I am, he's got a veneer of civilization ... now wait. He trades on that. He's always dealt with people who are too civilized to use his own methods. The trick would be to call his bluff. And Ivan's the man who could do it." "But you don't understand." "Didn't everybody in Russia tremble with fear at Ivan's name?" "Yes, in--"