"Oh, he's changed all right," the Army doctor answered. "He's not the same man as he used to be." "How is he different?" Mitchell demanded. The medic examined Mitchell and Ferris critically before answering. "He used to be a mathematical genius." "And now?" Mitchell said impatiently. "Now he is a moron," the medic said. III Mitchell tried to stop Colonel Sidney as he went past, but the doctor mumbled he had a report to make. Mitchell and Ferris stared at Colonel Carson and Macklin and at each other. "What did he mean, Macklin is an idiot?" Mitchell asked. "Not an idiot," Colonel Carson corrected primly. "Dr. Macklin is a moron. He's legally responsible, but he's extremely stupid." "I'm not so dumb," Macklin said defensively. "I beg your pardon, sir," Carson said. "I didn't intend any offense. But according to all the standard intelligence tests we have given you, your clinical intelligence quotient is that of a moron." "That's just on book learning," Macklin said. "There's a lot you learn in life that you don't get out of books, son." "I'm confident that's true, sir," Colonel Carson said. He turned to the two biologists. "Perhaps we had better speak outside." "But--" Mitchell said, impatient to examine Macklin for himself. "Very well. Let's step into the hall." Ferris followed them docilely. "What have you done to him?" the colonel asked straightforwardly. "We merely cured him of his headaches," Mitchell said. "How?" Mitchell did his best to explain the F-M Virus. "You mean," the Army officer said levelly "you have infected him with some kind of a disease to rot his brain?" "No, no! Could I talk to the other man, the doctor? Maybe I can make him understand." "All I want to know is why Elliot Macklin has been made as simple as if he had been kicked in the head by a mule," Colonel Carson said. "I think I can explain," Ferris interrupted. "You can?" Mitchell said. Ferris nodded. "We made a slight miscalculation. It appears as if the virus colony overcontrols the supply of posterior pituitary extract in the cerebrum. It isn't more than necessary to stop headaches. But that necessary amount of control to stop pain is too much to allow the brain cells to function properly." "Why won't they function?" Carson roared. "They don't get enough food--blood, oxygen, hemoglobin," Ferris explained. "The cerebral vessels don't contract enough to pump the blood through the brain as fast and as hard as is needed. The brain cells remain sluggish, dormant. Perhaps decaying." The colonel yelled. Mitchell groaned. He was abruptly sure Ferris was correct. * * * * *