"Do you have any idea what you're doing?" asked Jake. "None in the least," said Phillip happily, "except that it's never been done before. But maybe it's time we tried following our noses for a while." * * * * * The tidal wave began to break two days later ... only a few people here, a dozen there, but enough to confirm the direst newspaper predictions. The boomerang was completing its circle. At the laboratory the doors were kept barred, the telephones disconnected. Within, there was a bustle of feverish--if odorous--activity. For the three researchers, the olfactory acuity had reached agonizing proportions. Even the small gas masks Phillip had devised could no longer shield them from the constant barrage of violent odors. But the work went on in spite of the smell. Truckloads of monkeys arrived at the lab--cold-ridden monkeys, sneezing, coughing, weeping, wheezing monkeys by the dozen. Culture trays bulged with tubes, overflowed the incubators and work tables. Each day six hundred angry students paraded through the lab, arms exposed, mouths open, grumbling but co-operating. At the end of the first week, half the monkeys were cured of their colds and were quite unable to catch them back; the other half had new colds and couldn't get rid of them. Phillip observed this fact with grim satisfaction, and went about the laboratory mumbling to himself. Two days later he burst forth jubilantly, lugging a sad-looking puppy under his arm. It was like no other puppy in the world. This puppy was sneezing and snuffling with a perfect howler of a cold. The day came when they injected a tiny droplet of milky fluid beneath the skin of Phillip's arm, and then got the virus spray and gave his nose and throat a liberal application. Then they sat back and waited. They were still waiting three days later. "It was a great idea," Jake said gloomily, flipping a bulging notebook closed with finality. "It just didn't work, was all." Phillip nodded. Both men had grown thin, with pouches under their eyes. Jake's right eye had begun to twitch uncontrollably whenever anyone came within three yards of him. "We can't go on like this, you know. The people are going wild." "Where's Coffin?" "He collapsed three days ago. Nervous prostration. He kept having dreams about hangings." Phillip sighed. "Well, I suppose we'd better just face it. Nice knowing you, Jake. Pity it had to be this way." "It was a great try, old man. A great try." "Ah, yes. Nothing like going down in a blaze of--" Phillip stopped dead, his eyes widening. His nose began to twitch. He took a gasp, a larger gasp, as a long-dead reflex came sleepily to life, shook its head, reared back ... Phillip sneezed. He sneezed for ten minutes without a pause, until he lay on the floor blue-faced and gasping for air. He caught hold of Jake, wringing his hand as tears gushed from his eyes. He gave his nose an enormous blow, and headed shakily for the telephone.