According to the insulated register, he was now in 1976. He lowered speed until he registered April, then maneuvered slowly backward through time to the eighteenth, the day of the infamous Guided Missile Experiment. Carefully, carefully, like an obstetrician supervising surgical robots at an unusually difficult birth, he watched the register until it rolled to rest against the notch that indicated the exactly crucial moment. Then he pushed a button and froze the machine where it was. All he had to do now was materialize in the right spot, flash out and push the red switch from him. Then his exciting adventure would be over. But.... He paused and tapped at his sleek chin. He was supposed to do something a second before materialization. Yes, that nervous theoretician, Bob Skeat, had given him a last suggestion. He picked up the small metal box, twisted around to face the opening of the time machine and dropped it into the gray murk. A solid object floating near the opening attracted his attention. He shot his arm out--it was _cold_, as cold as they had figured--and pulled the object inside. A sealed metal cylinder. Strange. What was it doing out there? Anxiously, he opened it, not daring to believe he'd find a document inside. Yes, that was exactly what it was, he saw excitedly. He began to read it rapidly, very rapidly, as if it were a newly published paper on neutrinos. Besides, the manuscript was written with almost painful simplicity, like a textbook composed by a stuffy pedagogue for the use of morons. The problems all began with the Guided Missile Experiment of 1976, he read. There had been a number of such experiments, but it was the one of 1976 that finally did the damage the biologists had been warning about. The missile with its deadly warhead exploded in the Brazilian jungle through some absolutely unforgivable error in the remote-control station, the officer in charge of the station was reprimanded and the men under him court-martialed, and the Brazilian government was paid a handsome compensation for the damage. * * * * * But there had been more damage than anyone knew at the time. A plant virus, similar to the tobacco mosaic, had mutated under the impact of radioactivity. Five years later, it burst out of the jungle and completely wiped out every last rice plant on Earth. Japan and a large part of Asia became semi-deserts inhabited by a few struggling nomads. Then the virus adjusted to wheat and corn--and famine howled in every street of the planet. All attempts by botanists to control the Blight failed because of the swiftness of its onslaught. And after it had fed, it hit again at a new plant and another and another. Most of the world's non-human mammals had been slaughtered for food long before they could starve to death. Many insects, too, before they became extinct at the loss of their edible plants, served to assuage hunger to some small extent.