"I told you it was small. You want it to be a giant, don't you, Miss Fellowes?"
She dimpled. "I do, I suppose. It's only natural. The first thing anyone thinks of when dinosaurs are mentioned is their enormous size. And this one is, well, so tiny."
"A small one is all we aimed for, believe me. You can imagine what would happen here if a full-grown stego-saurus, say, suddenly came thundering into Stasis and started lumbering around the laboratory. But of course there isn't enough electrical energy in six counties to create a Stasis field big enough to handle something that size. And the technology itself isn't developed enough yet to allow for significant mass transfer, even if we could get the power we'd need to do it."
Miss Fellowes stared. She felt a chill. A living dinosaur, yes! How fantastic!
But so tiny-more like a bird without feathers, it was, or some peculiar kind of lizard"If it isn't big, why is it a dinosaur?" "Size isn't the determining factor, Miss Fellowes. What causes an animal to be classed as a dinosaur is its bony structure. The pelvic anatomy, primarily. Modern reptiles have limbs that go out sideways, like this. Think of the way a crocodile walks, or a lizard. More of a waddle than a stride, wouldn't you say? There aren't any upright crocodiles walking around on their hind legs. But the dinosaurs had bird-like pelvises. As everyone knows, many of them were able to walk upright as modern two-legged creatures do. Think of an ostrich; think of long-legged wading birds; think of the way our own legs are attached. Even the dinosaurs who stayed closer to the ground on all four legs had the sort of pelvis that allowed the legs to descend straight instead of sticking out to the sides the way a lizard's do. It's an entirely different evolutionary model, a line one which led down from dmosau-rian reptiles through birds to mammals. And the saurian end of it died out. The only reptiles that survived the Great Extinction at the end of the Mesozoic were the ones with the other kind of pelvic arrangement."
"I see. And there were small dinosaurs as well as big ones. It just happens that the big ones are the ones that captured our imaginations."
"Right. Those are the famous ones that everybody goggles at in the museums. But plenty of species were only a few feet high. This one, for instance."
"I can understand now why people lost interest in it so fast. It isn't scary. It isn't awesome."
"Laymen may have lost interest, Miss Fellowes. But I assure you that this Httle fellow has been a revelation to scientists. It's being studied day and night, and some veYy interesting things have been discovered. For instance, we've been able to determine that it's not entirely coldblooded. Which confirms one of the most controversial theories about dinosaurs ever set forth. Unlike any modern species of reptile, it has a method of maintaining internal temperatures higher than that of its environment. Not a perfect method, not by any means-but the fact that it has one at all backs up the skeletal evidence putting dinosaurs on the direct line of evolution leading toward birds and mammals. The creature that you're looking at is one of our own most distant ancestors, Miss Fellowes."
"If it is, aren't you messing up evolutionary history by pulling it out of its own era? Suppose this one dinosaur was the key link in the whole evolutionary chain?"
Hoskins laughed. "I'm afraid evolution doesn't work as simply as that. No, there's no risk here of changing evolutionary history. The fact that we're all still here, after this fellow has been transported a hundred million years across time, should be proof enough of that."
"I suppose so. -Is it a male or a female dinosaur?"
"Male," said Hoskins. "Unfortunately. Ever since we brought it in, we've been trying to get a fix on another of the same species that might be female. But doing that makes looking for a needle in a haystack seem like a cinch."
"Why get a female?"
He looked at her quizzically. "So that we might have a fighting chance to obtain some fertile eggs, and breed a line of baby dinosaurs here in the laboratory."
She felt foolish. "Of course."
"Come over here," Hoskins said. "The trilobite section. You know what trilobites are, Miss Fellowes?"
She didn't answer. She was watching the little dinosaur pathetically skittering around in its confinement area, bewilderedly running from one wall to the other. It would run right into the wall and bounce offbefore turning back. The stupid creature didn't seem to be able to comprehend the reason why it couldn't just keep going, out into the open, off into the dank swamps and torrid forests of its prehistoric home.
She thought of Timmie, penned up across the way in his own little set of rooms.
"I said, Miss Fellowes, do you know what trilobites are?"
"What? Oh-yes. Yes. Some sort of extinct kind of lobster, isn't that so?"
"Well, not exactly. A crustacean and extinct, but not at all like a lobster. Not much like anything now living, as a matter of fact. Once they were the dominant life-form of the Earth, the crown of creation. That was half a billion years ago. There were trilobites wherever you looked, then. Crawling around on the floor of every ocean by the millions. And then they all died out: we can't yet say why. Leaving no descendants, no genetic heritage whatever. They were here, they were fruitful and multiplied, and then they vanished as though they had never been. Leaving fossils of themselves behind in enormous quantities."
Miss Fellowes peered into the trilobite tank. She saw six or seven sluggish gray-green creatures three or four inches long, sitting on a bed of gray ooze. They looked like something you might see at the seashore in a tide-pool. Their narrow, oval, hard-looking bodies were divided the long way into three ridged sections, a raised central one and two smaller side lobes fringed with little spikes. Huge dark eyes were visible at one end, faceted like the eyes of insects. As Miss Fellowes watched, one of the trilobites pushed an array of tiny jointed legs outward from its sides and began to crawl-slowly, very slowly- across the bottom of the tank.
The crown of creation. The dominant life-form oTits time.
A man in a lab coat appeared, wheeling a tray on which some complex, unfamiliar device was mounted. He greeted Hoskins amiably and gave Miss Fellowes an impersonal grin.
"This is Tom Dwayne of Washington University," Hoskins said. "He's one of our trilobite people. Tom's a nuclear chemist. -Tom, I want you to meet Edith Fellowes, R.N. She's the wonderful woman who's taking care of our new little Neanderthal."
The newcomer smiled again, considerably less impersonally this time. "A great honor to meet you, Dr. Fellowes. You've got a tremendous job on your hands."
"Miss Fellowes will do," she said, trying not to sound too stuffy about it. -"What does a nuclear chemist have to do with trilobites, if you don't mind my asking?"
"Well, actually I'm not studying the trilobites per se," Dwayne said. "I'm studying the chemistry of the water that came here with them."
"Tom's taking isotope ratios on the oxygen contained in the water," said Hoskins.
"And why is that?"
Dwayne replied, "What we have here is primeval water, at least half a billion years old, maybe as much as six hundred million. The isotope ratio gives us the prevailing temperature of the ocean at that time-I could explain in detail, if you like-and when we know the ocean temperature, we can work out all sorts of other things about the ancient planetary climate. The world was mostly ocean at the time the trilobites flourished."
"So you see, Miss Fellowes, Tom doesn't really care about the trilobites at all. They're just ugly little annoyances, crawling around in his precious primeval water: The ones who study the trilobites themselves have a much easier time of it, because all they have to do is dissect the critters, and they don't need anything but a scalpel and a microscope for that. Whereas poor Tom has to set up a mass spectrograph in here each time he conducts an experiment."
"Why's that? Can't he-"
"No, he can't. He can't take anything out of its Stasis bubble and there's no way around that. It's a matter of maintaining the balance of temporal potential."
"The balance of temporal potential," Miss Fellowes repeated, as though Hoskins had said something in Latin.
"An energy-conservation problem. What comes across time is traveling across lines of temporal force. It builds up potential as it moves. We've got that neutralized inside Stasis and we need to keep it that way."
"Ah," said Miss Fellowes. Her scientific training had never included much physics. Its concepts were largely lost on her. It was a reaction, perhaps, to the unhappy memories of her marriage. Her former husband had liked to go on and on about the "poetry" inherent in physics, the mystery and magic and beauty of it. Maybe it actually had some. But anything that could be associated with her former husband was something that Miss Fellowes didn't care to think about very deeply.