Gerrod looked after Davis. He had vanished inside the little vine-covered summerhouse, where Nita was waiting. Evelyn lifted her lips invitingly, and Gerrod responded to the invitation instantly. Both of them laughed together.
"As a husband of some six months' standing," said Gerrod with severity, "I protest against this undignified conduct you encourage me to continue."
Evelyn rubbed her cheek against his.
"We really ought to be getting back to work on those silly animals," she said reluctantly. "It's beginning to look rather serious. It may be just panic, though."
"Don't believe it." Gerrod was in earnest. "They've covered all the beaches with their sticky slime, and they're creeping inland. The rivers are choked with them, and floods are already threatening to become destructive."
"But it's so silly!" protested Evelyn. "Just because some little animalcule decides to multiply and keep on multiplying——"
"We have to get to work," finished Gerrod. "Come on into the laboratory."
They went into their workshop arm in arm. Evelyn and her husband worked together upon the problems in which they were interested, and indeed Evelyn was nearly as capable a physicist as was Gerrod. Her suggestions had helped him immensely when he and Davis battled with the cold bombs Varrhus had used in his attempt to bring the whole earth under his sway. Now they were laboring together to try to find a means of combating the silver menace that threatened the world.
"You're sure there's no exaggeration in the fear that the silver animals will actually grow up on solid ground?" asked Evelyn as she slipped into the long white apron that covered her from head to foot.
"Not much chance," said Gerrod, shaking his head. "I went down to Davis' aviation station last week. They've had to abandon the hangars nearest the water. The slimy stuff has covered the whole beach and is still creeping up. The smell is over everything, and the animals grow and grow. They've reached one of the buildings and crawled up the sides. They plastered the walls with a thick coating and even covered the roof. Height doesn't seem to bother them. They'll creep up a straight wall, and nothing seems to stop them."
"Well, they don't grow very fast," said Evelyn slowly. "There's still a lot of time left to fight them in."
"Don't believe it. They covered the Atlantic in three months. How long will they take to cover the continent?"
"You make me shiver," protested Evelyn.
"I'm doing a little shivering myself," said Gerrod grimly. "Every river in the United States is choked up with them, and they grow upstream without the least difficulty. They're creeping up the banks of the streams just as they creep over the beaches. The banks of the Hudson are a mass of silvery slime that's still expanding."
Evelyn began to look a trifle worried.
"But how far can they go from the rivers—from water?"
"They have gone three miles inland," said Gerrod grimly, "along the Carolina coast, where the shore slopes down gently to the sea. Up in Maine there are places where they have only covered a quarter of a mile. In both places, though, they are still creeping inland."
He picked up one of the test tubes.
"Something must be done to stop them. How does the cauterizing seem to work?"
"Not at all; it doesn't even make them pause."
Since their discovery that the jelly formation was caused by the tiny animalcules fusing themselves into one organism, Gerrod had thought of searing the edge of the silvery mass with a hot flame. The heat had baked and killed the animalcules for a distance of some two or three inches into the mass, and he had hoped that by that means their growth might be stopped. They had simply absorbed the seared portion into themselves as food, however, and grown on outward as before. Their means of reproduction made such a proceeding perfectly possible. Under favorable conditions of moisture and food, each of the animalcules multiplied itself by as many times as the number of tentacles it possessed. The animals themselves were tiny, jellylike creatures incased in a spherical, silicious shell from dozens of holes in which fat, restless tentacles protruded. Normally the tentacles provided the microscopic creature with the means of securing its food. Gerrod had discovered now that it was by those tentacles that they reproduced. One of the tentacles began to swell and grow a round spot at the tip. A shimmering, silvery shell appeared around the swollen portion. Within an hour from the appearance of the shimmer that showed that the protecting shell had been formed tiny, fat, jellylike tentacles protruded themselves from openings in the newly formed shell. With almost incredible rapidity the creature grew to the size of its single parent. Then the connecting tentacles snapped and a new silvery animalcule prepared to reproduce in its turn.
"And Davis is just as oblivious of the Silver Menace as if it did not exist," remarked Gerrod suddenly some time later, apropos of nothing.
Evelyn smiled indulgently and did not answer. She was trying to find if it were not possible that upon exhaustion of the food supply the animalcules would attack each other and so destroy themselves. She had sealed up small quantities of the evil-smelling jelly in test tubes where they could not possibly find fresh supplies of food. When the available nourishment was exhausted, however, they simply joined their tentacles and remained absolutely at rest, their tiny forms immobile. They did not starve, because they were using up no energy in movement. She had kept some of them for over a week in just this state of inactivity, but on being supplied with fresh water they resumed their interrupted multiplication with feverish energy.
On the beaches the slimy, silvery menace lay in absolute repose. No tremor of waves disturbed its placidity. The whole sea as far as the eye could reach was a mass of utterly quiet silver, reflecting perfectly the cloudless sky. Only at the edges of the mass was any movement visible, and that movement was a slow but inexorably sure creeping inland. Whole colonies of houses were garbed in the glistening, shining horror, and the jellylike stuff filled the roads between. And over all hung the foul, musklike odor as of slime dredged up from the bottom of the ocean.
The sun shone down perpetually from a clear blue sky now. Its fierce heat had dried out the upper surface of the silver sea into a shining mass like glistening parchment, and the breezes that blew were hot and dry. There was no longer evaporation from the sea, and the winds that blew to the shore from the ocean were like blasts from an arid desert. At night, too, the ocean no longer exerted its former function of moderator of the climate. The sun's heat was no longer absorbed by the water by day, to be given up to the breezes again at night. The winds of the ocean by day were hot, dry, foul-smelling blasts, and at night were chill and penetrating. Already the crops—which threatened to be the last ever garnered on the planet—were failing from lack of rain, and there was no relief in sight. It looked as if that part of the population which was not overwhelmed by the slimy masses of the Silver Menace would face death by starvation. Some few enterprising farmers had gone to the shore and filled wagons with the horrible jelly to spread on their farms as fertilizer. The whole world knew that the Silver Menace was simply a mass of microscopic animals, and the farmers thought they would provide their plants with animal humus by plowing the glistening stuff underground.
They soon learned their mistake. What little moisture remained in the earth was absorbed by the greedy animalcules, who multiplied exceedingly. The farmers learned of their error when they tried to cross their fields. The ground had become spongy and exuded quantities of the Silver Menace at every pore. The crops were covered with a glistening film of the horrible, sticky stuff, which weighted down and finally buried the green plants under its shining masses.