This happened after ten minutes of top-limit running. Then came five minutes of recuperation under suggestion: "Your heart is beating slower. You're breathing slowly and deeply ... relaxing ... relaxing." Someone took his arm and he was off again, this time on the old, reliable Harvard Step-Test, jumping up on the chair and back down. He did this until once again he lay panting on the floor, hardly able to move as his pulse and respiration changes were carefully recorded. Next in line came a lively handball game. He was handed a small, hard-rubber ball, and asked to engage in a game of catch with a machine that was stationed at the end of a cubby. The machine played hard, spinning the ball around and hurling it at Jeff with such incredible rapidity that he was forced to abandon all thinking. Instinctively, he reached out to catch the ball. His fingers burned with pain as he caught it and passed it in, only to have it hurled back out again, twice as fast. Soon he moved as automatically as a machine, catching, hurling, his mind refusing to accept the aching and swelling in his fingers, as the ball struck and struck and struck.... Then a small ladder was rolled in. He listened carefully to instructions and then ran up and down the ladder until he collapsed off the top. He was rested gently on the floor while blood samples were taken from his arm. Then he sat, staring dully at the floor. A voice said, "Relax, Jeff, take a rest. Sleep quietly, Jeff. You'll be ready to dig in and fight in a minute. Now just relax." Several people were about; one brought him a heavy, sugary drink, lukewarm and revolting. He drank it, gagging, spilling it all down his shirt front. Then he grinned and licked his lips while further blood samples were drawn. And then, he was allowed to take a drink of cool water. He was left staring at his feet for five whole minutes of recuperation before the next stage of the testing commenced. * * * * * The lights were in three long columns. They extended as far as Jeff could see to the horizon. Some were blinking; some shone with steady intensity, while others were dark. "Call the columns one, two and three," said Dr. Gabriel, close by, his voice soft with patience. "Record the position of the lights as you see them now. Then when the signal sounds, start recording every light change you see in all three columns. Do it fast, Jeff, as fast as you can." The eye is a wonderful instrument of precision, capable of detecting an infinitude of movement and change. It is delicate enough to distinguish, if necessary, each and every still frame composing the motion picture that flickers so swiftly before it on the white screen. Jeff's fingers moved, his pencil recorded, quickly moving from column one to column two, and on to column three. The pencil moved swiftly until the test was over. Then on to the next test.... Electrode leads were fastened to each of his ten toes and each of his ten fingers.