"We can't go on!"

"But we must! We have no choice!"

"We'll be killed!"

"No, no-we'll stay on the ridge, I know the way!"

"It's too exposed!"

This was the very reason that they must take the ridge. The slopes to either side would be swept by avalanches, and even if they escaped these, they would be likely to wander onto a glacier. The ridge, on the other hand, would be blown clear of snow, providing a rocky road down to safety. It would be windy, but no wind could blow a man from a rock; if gusts threatened to do so, one could always lie flat till they were over.

Irritably he tried to explain this, but Bixby would have none of it. He just shook his head and shouted again, "We can't go down!" He looked the same as always, face calm, his shouts in a reasonable tone of voice; but there was a stubbornness in him, and when Muir shouted, "I memorized the way down the ridge," he stared at Muir as if confronted with a madman. And the thunder crashed, and the hurtling air roared across the ridge, catching on a million jagged lava teeth and shrieking, keening, howling, drowning out mere human voices.

"We must go down!" Muir shouted again. "We have no choice!"

"We can't go down! It's impossible! We'll be killed!"

"It's stopping will kill us!" Muir replied, getting angry. Stupid man, did he think this block's feeble shelter would be enough to protect them? "We have no choice!" he repeated.

Bixby shook his head. For an instant he looked like Muir's father, insisting on a point of Bible doctrine. "I won't go on!"

"We must go on!"

"I won't go on!"

And that was that. There is a stubbornness in fear that will balk at even the most perfect logic. Muir tugged furiously at his beard. "What do you propose to do!" he shouted.

Bixby wiped the snow from his face and looked around, blinking cowlike. "The fumaroles are warm," he said.

"The fumaroles are boiling!" boiling!" Muir shouted. Anger spiked through him, he wanted to grab the man by the coat and shake his courage back into him. "Superheated poison gas!" Muir shouted. Anger spiked through him, he wanted to grab the man by the coat and shake his courage back into him. "Superheated poison gas!"

But Bixby was trudging back toward the fumaroles, hunched into the wind, staggering as gusts shoved him from side to side. "Fool!" Muir cried, and cursed him roundly.

He stayed by the block, searching the clouds for a break that he could use as argument to convince Bixby to continue. But none came; the storm raged on; and suddenly he realized that his anger at Bixby was a transitive expression of his own fear. He could not leave his companion behind; and so now they were both in very great danger.

The fumaroles near the peak were among the last small vestiges of Shasta's volcanic glory. Superheated gases rose through cracks in the long throat, and emerged in a small depression on the western side of the summit, where they heated a mixture of snowmelt, volcanic ash, and sand, creating a patch of boiling black mud.

Muir approached it. In the storm's cold air the patch steamed heavily, making it look like the clouds were pouring out of the mountain as well as rushing over it: an eerie sight. Bixby was already crouched at the mud's edge. Muir stomped to his side.

Bixby looked up. "This will keep us safe from frost!"

"Oh yes, safe from frost!" Muir said sarcastically. "But how will we keep from scalding ourselves? And how will we protect our lungs from the acid gases? And how will we get off the mountain once we soak our clothes? Storm or clear, we'll freeze on our way down! We'll have to stay until morning, and who knows what kind of day it will be!"

Bixby shivered miserably.

Muir held his breath, let out a long sigh. There was nothing for it. They were there. He crouched and looked over the roiling snow-rimmed pit. Wind whipped any warmth coming off the mud directly away; their zone of safety was about a quarter of an acre in extent, but only an eighth of an inch thick. Scylla and Charybdis, embracing.

Muir sighed again and tromped into the mud, sinking immediately to his knees and feeling the heat burn his legs. Jetting bubbles of gas made the mud look like molten lava. But on the windward side of the pool they would probably be safe from the gas. As long as the wind held steady. And it seemed it would; it roared out of the west, cutting through clothing; they couldn't stand in it long. Growling, Muir finished sitting in the shallows of the pool. Hot water seeped out of the mud into his pants, then his shirt and coat. He lay back, his head against the windward s...o...b..nk, his body outstretched in the mud. Spindrift ran across his face. His nose, which had no feeling to it, still conveyed to him the stench of sulphur. The warmth of the mud burned his skin, but he had to admit it was a relief from the fierce wind. A laugh burst from him like gas from the mud; then a jet of rising bubbles scalded his back and he yelped, rolled hastily to the side. He elbowed a snow and mud poultice over the hot spot, dizzy with the carbonic stink. Now he was covered with mud, his coat and trousers completely soaked. Bixby was the same. Standing up would have turned them into ice statues of themselves. They were committed.

It was necessary to shift position frequently, to immerse an exposed limb, or expose a boiled one. The pa.s.sage of time was marked by pain. The storm continued unabated, and the two men lay isolated by the shrieking wind, so that each might have been there alone except that occasionally Muir would raise his head and cry out, and Bixby would shout something back, and both would subside into solitude again. Snow fell so thickly that they breathed it. It settled on the exposed parts of them, and packed to a rime so hard that they crackled when they shifted.

The sun had apparently set, and it was dark. Muir could see nothing but blackness. At times the mud seemed blacker than the sky; then the sky would seem blacker than the mud. As black as the world had been during his episode of blindness, so many years before. He saw the file leaping into his eye, the aqueous humor draining into his hand, the swift darkening in his sight on the wounded side, and then, that night as he lay trembling in a strange bed, the relentless darkening on the other. Until he was left in total darkness. That fear had been the worst of his life; this was nothing to it, a natural darkness, a storm in its fury to be watched and loved. I will lift up mine eyes unto the hills, and see. see. He had been blind for three weeks, three full weeks of doctor's a.s.surances and secret terror; and when his sight had returned he had walked out of his life and never returned, never looked back, tossing away the destiny that his father and country had thought proper for him, farming, inventing machinery, all that; he abandoned all that and gave himself to the wilderness. So that, properly speaking, it was in fact a blessing to be here boiling in a volcano's caldera with a blizzard thick about his ears. Part of nature's bounty- He had been blind for three weeks, three full weeks of doctor's a.s.surances and secret terror; and when his sight had returned he had walked out of his life and never returned, never looked back, tossing away the destiny that his father and country had thought proper for him, farming, inventing machinery, all that; he abandoned all that and gave himself to the wilderness. So that, properly speaking, it was in fact a blessing to be here boiling in a volcano's caldera with a blizzard thick about his ears. Part of nature's bounty- Groans from Bixby broke his thought. He saw the lump of the man, rolling to escape a fumarole, struggling to keep from sinking. In some places the mud was viscid clay, in others black tea, whistling in its pot. Lumps of something, perhaps soaked pumice, floated under the surface, and he tried arranging a bed of the lumps under him to protect him from rising gas jets, but they kept slipping away. The wind still howled, but the clouds were thinning; the snow blowing across their bodies must have been spindrift, for he saw a star. If you can see one star, press on! as the saying had it. But not tonight.

Soon the clouds scudded off east, and starlight bathed the scene. The familiar patterns sparked the night sky, drawing around him all the other nights he had lain out in the world. The eye is a flower that sees the stars. If they had continued their descent, they would now be down on the snow slopes, where starlight would have made darkness visible, and guided them home. Instead, soaked as they were, and with a mile of wind-ripped ridge to negotiate, they were going to have to spend the night. But he said nothing. It was done. And his fault really, for staying on the peak so long. Besides, the sight of the stars brought it to him that whatever the discomfort, they were likely to survive; so it did not signify. He had spent many a cold night on a mountain. It could even be said that the boiling mud made this night less miserable than some, though-the skin of his back suddenly flaring-none other had been so purely painful. Still, he was used to pain, accustomed to it. He had grown up with it, working a hardscrabble farm for his father, a mean, small-minded man, a lesson in how not to be a Christian, all those days spent studying the Bible while his boys worked to get his bread, and then beating them with switch, belt- His leg was on fire. He pulled his knee up into the icy wind, and for an instant smelled the gas. Once his father had set him to digging wells, and seventy feet down seeping gas had overwhelmed him, he had swooned and had only just come to, only just dragged himself far enough up the rope ladder to breathe good air, and live. He lifted his head and shouted at Bixby. "Still there, Jerome?"

A croak. Something about the cold. Still there. Muir settled back into the mud. Forget that whole world, that whole life, the way it could make his stomach knot. Look at the stars. The eye is a flower that sees the stars, immersed in primal cold and heat. His left foot squelched in its boot, propped on the s...o...b..nk. Wiggle the toes against wet leather, make sure they were still there. No. They were cold past feeling, only a certain vague numbness; while his right foot burned, scalded so that he nearly shouted, and certainly groaned. Leg yanked up; the wind wrapped the wet trouser to his leg and froze his thigh, while the foot still throbbed with the pain of the burn.

"Are you suffering much?" Bixby called.

"Yes!" Fool, what did he think? "Frozen and burned! But never mind, it won't kill us!" As long as they weren't overcome by gas. A jet of bubbles pushed at his backbone, he rolled and shoved mud over the scalding spot, hitting at it furiously with a fist gone numb with frostbite.

Each hour was a year. The stars were in the same places they had been when they first became visible; so not many years could have pa.s.sed. Concentrating on the stars near the horizon, he tried to see them creep west. That one, nearly occluded by a low wall of lava: focus on it, watch it, watch it, watch it... had it moved? No. Time had stopped. They had continued the descent, perhaps, and died in the attempt, and now they lay in some well-bottom h.e.l.l of his father's stripe, or in a circle of Dante's inferno, in which heat and cold mingled without moderating the other, creating a pain unfamiliar to those in the simpler circles. He could hear their moans- Ah, that star was occluded. Half an hour had jumped past all at once. As if time were a matter of instantaneous jumps, from one eternal moment to the next-which in fact it often seemed to him to be, as during those sunny warm afternoons when he would lie in a Sierra meadow by a chuckling stream and watch the clouds, dreaming of nothing, until with a jerk he would return to the meadow and the shadows would be stretching twice as long as before, over perfectly sculpted patches of meadow gra.s.s, the larks singing "we-ero, spe-ero, we-eo, we-erlo, we-it."

Drifting in and out. A call to Bixby got a feeble response. Still alive if nothing else. A bubble burst, splashed hot mud over his face, and he spluttered and wiped his nose clear. He couldn't feel his left arm, or make it move; he wasn't sure when that had happened. That was his windward side, so presumably it was benumbed in the onslaught of air. He tried to dip the arm further under the mud, to bury it. Not a process one would want to carry too far, descending limb by limb into black muck. Now the arm seemed to be burning; was that a fumarole bubbling up? No. In fact he had accidentally plunged the arm into the s...o...b..nk; his right hand confirmed it. But how the skin burned!

Then a gas bubble lifted his knee, and the back of his leg felt like glacier melt had been poured over it; it ached with cold, the knee joint creaked with it! He groaned. Cold now scalded and heat froze, and he didn't know which was which!

Perhaps it didn't matter. Caught between cold reason and hot pa.s.sion, ignorant flesh always paid the price. One could never tell which was which. Outrageous pain! Better to leave all that behind.

A solution occurred to him. He stood up. He looked back down and saw his body lying there, stretched out in the mud, mostly submerged. A sponge, soaked in immortality. A ma.s.s of eternal atoms, bound together in just that particular way, to witness the beauty of the universe.

Yes: he stood there gazing down at his boiled and frozen body. Somewhat bemused, he tried a few steps; circled the mud patch; then took off across the windswept snow, toward an exposed rock outcropping. There was a building there, a small square cabin, white in the starlight. As he approached he saw that its walls were made of pure white quartz. Its door and windows were edged with quartz crystals. The door and the roof were made of slate, all dotted with lichen. The windows were thin smooth sheets of water.

He opened the door and walked in. The table was a slab of glacier-polished granite. The benches around it were fallen logs. The bed was made of spruce boughs. The carpet was green moss.

It was his home. He sat on one of the logs, and put his hand on the table. His hand sank into the granite. His body sank into the log, and then into the moss, and then into the quartz.

He felt himself dissolving out into the great ma.s.s of the mountain, tumbling slowly down through the rock. He had melted into Shasta. The mountain mumbled in his ear "I am." With a puff of its cheeks it blew him aloft, threw his atoms out into the sky. They tumbled off on the wind and dispersed to every point of the compa.s.s, then fell and steeped into the fabric of the land, one atom in every rock, in every grain of sand and soil, like gas in mud, or water in sponge, until his body and California were contiguous, united, one. Only his vision remained separate, his precious sight, the landscape's consciousness soaring like a hawk over the long sand beaches, the great valley, the primeval sequoias, the range of light-but the mountains were different-blinding glaciers covered all but the highest peaks, fingered down through the hills, and cut Yosemite's walls. Then they retreated, dried up and ran away.

He tumbled, soared west. It was night, now, and below lay the bay like a sparkling black map, the black water crisscrossed with bridges of light, the surrounding hills dotted with millions of white points like stars, defining towers, roadways, docks, arenas, monuments; a bay-circling city, impossibly beautiful. But so many people! It had to be thousands of years in the future, as glaciers were thousands of years in the past. He was soaring through time, out of the knife-edge present, back to glaciers and forward to supercities, perhaps ten thousand years each way. An eyeblink in the life of stones, and the Sierra would stand throughout; but chewed at by the future city as much as by the ancient glaciers, perhaps. Sheep cropped meadows to dust in a single summer; and the shepherds were worse. And if so many came to live by the bay....

Curious, fearful, he tilted in his flight, soared east over the great valley, through the gold-choked foothills, up among the peaks. He rose in a gyre and stared down at starlit granite. There a valley had been drowned, a shocking sight. Wheel, turn, soar, take heart: for all was dark. Not a light to be seen, the whole length of the range. The backbone of California, gleaming in moonlight.

This much beauty would always be in danger, there was no avoiding that. Its animals must defend it. All its animals. He soared over the highest peaks, and then looked back; a full moon bathed the great eastern escarpment with white light. Death Valley burned, Whitney froze- His ankle was in a fumarole, his head in the muddy s...o...b..nk. He shifted, saw that the wheel of stars had turned nearly a quarter turn. He took several long deep breaths. His vision cleared with the cold air, he returned to the moment and his bed in the mud. He could feel his lungs and his mind; beyond that, he and the mountain still seemed one undifferentiated ma.s.s, which he felt only in a distant, seismic way. But now he knew where he was. For a while he had soared on a great wind through time, but now he was just John again, flat on his back, and numb with cold.

Still, he remembered the vision perfectly. That was quite a voyage great Shasta had sent him on! Perhaps visions like that were why the Indians worshipped it.

As for what he had seen... well, the habitable zone was never thick. Caught between the past and future, we squirm in a dangerous eighth of an inch. Perhaps it was like that always. The atmosphere, for instance, was frighteningly thin; hike for a day and you could ascend the larger part of it, as when climbing Shasta itself. The landscape was tightly wrapped in a thin skin of gas. And the earth itself rolled in a thin temperate sphere around the sun, a zone of heat that neither boiled the seas nor allowed them to freeze solid; that sh.e.l.l might only be a few feet thick, or an eighth of an inch, who knew? It was a miracle the earth rolled within that sphere! Delicate, precious dewdrop of a world, hung in the light with the nicest precision, like every dewdrop in every morning's spider-web....

The wheel of stars had turned again. Bixby was shifting, muttering as in a dream. The sky in the east was the black nearest blue. And then the blue nearest black. Light seeped into the world as if vision were a new faculty, a sense born instant by instant, to creatures formerly blind. The stars began to slip away; he watched a dim one grow fainter and then wink out of visibility, a strange moment. The eyes are flowers that see the stars.

Bixby croaked something about leaving. But they were on the western side of the peak, and it would be hours before the sun appeared. Meanwhile it was cold beyond movement. When they shifted, their coats crackled as if made of thin gla.s.s.

The sky, though cloudless, was a dull and frosty blue. He could see nothing of the earth but their mud patch, and the snow and lava bordering it. He still felt part of the mountain, with no discernable break between his skin and the mud. As the morning light blossomed it seemed to fill him, pouring through his eyes and down into the rock; he felt himself a conduit in a vast interconnected totality, an organism pulsing with its own universal breath. The heat at his core caught and burned, so that he was warm enough to melt his coat's sheath of ice; that was heat displaced from the volcano, which was heat displaced from the sun; which was heat displaced from the heart of the Milky Way; which was heat displaced from the heart of the universe, from that original heart's diastolic expansion. No dualism was significant in the face of this essential unity: he was an atom of G.o.d's great body, and he knew it. The landscape and his mind were two expressions of the same miracle.

On the lonely peak of a nearly extinct volcano, two black specks of consciousness observed the morning light.

The time came at last to try a descent. Imagination over reason, action over contemplation; thus he had always believed, and never more than now! It was time to think two thoughts down the mountain.

Spindrift sparked overhead like chips of mica, and then the sun cracked the mountaintop. They stood like golems new-made of clay, ice shattering from their chests, mud sluicing off their backs. They slapped their arms together and the world burned in their fingertips. Nature was the greatest teacher, for those who listened; and Muir had learned long ago that there was a reserve of energy at the end of any long period of suffering. It was something mountaineers often had the chance to discover.

They staggered crazy-legged over the long ridge. They reached the snow slopes and descended more rapidly, swimming through drifts, glissading at the top of little avalanches, falling on their faces; but all downward, and so of use, their weakness only speeding the descent.

Then the clean smell of pinesap cut through the sulphur stench in their hair, and they were at treeline. Bixby sat against a tree and rested, while Muir went on, in search of their host Sisson. G.o.dlike he strode through a meadow, its wildflowers exploding in his sight, dot after dot of pure drenched color. And then he saw Sisson's horses through the trees, and smelled his coffee on the fire. Smoke rose through slanting sunbeams. He was home; and now he was home.

s.e.xual Dimorphism

The potential for hallucination in paleogenomics was high. There was not only the omnipresent role of instrumentation in the envisioning of the ultramicroscopic fossil material, but also the metamorphosis over time of the material itself, both the DNA and its matrices, so that the data were invariably incomplete, and often shattered. Thus the possibility of psychological projection of patterns onto the rorschacherie rorschacherie of what in the end might be purely mineral processes had to be admitted. of what in the end might be purely mineral processes had to be admitted.

Dr. Andrew Smith was as aware of these possibilities as anyone. Indeed it const.i.tuted one of the central problems of his field-convincingly to sort the traces of DNA in the fossil record, distinguishing them from an array of possible pseudofossils. Pseudofossils littered the history of the discipline, from the earliest false nautiloids to the famous Martian pseudonan.o.bacteria. Nothing progressed in paleogenomics unless you could show that you really were talking about what you said you were talking about. So Dr. Smith did not get too excited, at first, about what he was finding in the junk DNA of an early dolphin fossil.

In any case there were quite a few distractions to his work at that time. He was living on the south sh.o.r.e of the Amazonian Sea, that deep southerly bay of the world-ringing ocean, east of Elysium, near the equator. In the summers, even the cool summers they had been having lately, the extensive insh.o.r.e shallows of the sea grew as warm as blood, and dolphins-adapted from Terran river dolphins like the baiji from China, or the boto from the Amazon, or the susu from the Ganges, or the bhulan from the Indus-sported just off the beach. Morning sunlight lanced through the waves and picked out their flashing silhouettes, sometimes groups of eight or ten of them, all playing in the same wave.

The marine laboratory he worked at, located on the seafront of the harbour town of Eumenides Point, was a.s.sociated with the Acheron labs, farther up the coast to the west. The work at Eumenides had mostly to do with the shifting ecologies of a sea that was getting saltier. Dr. Smith's current project dealing with this issue involved investigating the various adaptations of extinct cetaceans that had lived when the Earth's sea had exhibited different levels of salt. He had in his lab some fossil material, sent to the lab from Earth for study, as well as the voluminous literature on the subject including the full genomes of all the living descendants of these creatures. The transfer of fossils from Earth introduced the matter of cosmic-ray contamination to all the other problems involved in the study of ancient DNA, but most people dismissed these effects as minor and inconsequential, which was why fossils were shipped across at all. And of course with the recent deployment of fusion-powered rapid vehicles, the amount of exposure to cosmic rays had been markedly reduced. Smith was therefore able to do research on mammal salt-tolerance both ancient and modern, thus helping to illuminate the current situation on Mars, also joining the debates ongoing concerning the paleohalocycles of the two planets, now one of the hot research areas in comparative planetology and bioengineering.

Nevertheless, it was a field of research so arcane that if you were not involved in it, you tended not to believe in it. It was an offshoot, a mix of two difficult fields, its ultimate usefulness a long shot, especially compared to most of the enquiries being conducted at the Eumenides Point Labs. Smith found himself fighting a feeling of marginalization in the various lab meetings and informal gatherings, in coffee lounges, c.o.c.ktail parties, beach luncheons, boating excursions. At all of these he was the odd man out, with only his colleague Frank Drumm, who worked on reproduction in the dolphins currently living offsh.o.r.e, expressing any great interest in his work and its applications. Worse yet, his work appeared to be becoming less and less important to his advisor and employer, Vlad Taneev, who as one of the First Hundred, and the co-founder of the Acheron labs, was ostensibly the most powerful scientific mentor one could have on Mars; but who in practice turned out to be nearly impossible to access, and rumoured to be in failing health, so that it was like having no boss at all, and therefore no access to the lab's technical staff and so forth. A bitter disappointment.

And then of course there was Selena, his-his partner, roommate, girlfriend, significant other, lover-there were many words for this relationship, though none was quite right. The woman with whom he lived, with whom he had gone through graduate school and two post-docs, with whom he had moved to Eumenides Point, taking a small apartment near the beach, near the terminus of the coastal tram, where when one looked back east the point itself just heaved over the horizon, like a dorsal fin seen far out to sea. Selena was making great progress in her own field, genetically engineering salt gra.s.ses; a subject of great importance here, where they were trying to stabilize a thousand-kilometer coastline of low dunes and quicksand swamps. Scientific and bioengineering progress; important achievements, relevant to the situation; all things were coming to her professionally, including of course offers to team up in any number of exciting public/co-op collaborations.

And all things were coming to her privately as well. Smith had always thought her beautiful, and now he saw that with her success, other men were coming to the same realization. It took only a little attention to see it; an ability to look past shabby lab coats and a generally unkempt style to the sleekly curving body and the intense, almost ferocious intelligence. No-his Selena looked much like all the rest of the lab rats when in the lab, but in the summers when the group went down in the evening to the warm tawny beach to swim, she walked out the long expanse of the shallows like a G.o.ddess in a bathing suit, like Venus returning to the sea. Everyone in these parties pretended not to notice, but you couldn't help it.

All very well; except that she was losing interest in him. This was a process that Smith feared was irreversible; or, to be more precise, that if it had got to the point where he could notice it, it was too late to stop it. So now he watched her, furtive and helpless, as they went through their domestic routines; there was a G.o.ddess in his bathroom, showering, drying off, dressing, each moment like a dance.

But she didn't chat anymore. She was absorbed in her thoughts, and tended to keep her back to him. No-it was all going away.

They had met in an adult swimming club in Mangala, while they were both graduate students at the university there. Now, as if to re-invoke that time, Smith took up Frank's suggestion and joined him at an equivalent club in Eumenides Point, and began to swim regularly again. He went from the tram down to the big fifty-meter pool, set on a terrace overlooking the ocean, and swam so hard in the mornings that the whole rest of the day he buzzed along in a flow of beta endorphins, scarcely aware of his work problems or the situation at home. After work he took the tram home feeling his appet.i.te kick in, and banged around the kitchen throwing together a meal and eating much of it as he cooked it, irritated (if she was there at all) with Selena's poor cooking and her cheery talk about her work, irritated also probably just from hunger, and dread at the situation hanging over them; at this pretence that they were still in a normal life. But if he snapped at her during this fragile hour she would go silent for the rest of the evening; it happened fairly often; so he tried to contain his temper and make the meal and quickly eat his part of it, to get his blood sugar level back up.

Either way she fell asleep abruptly around nine, and he was left to read into the timeslip, or even slip out and take a walk on the night beach a few hundred yards away from their apartment. One night, walking west, he saw Pseudophobos pop up into the sky like a distress flare down the coast, and when he came back into the apartment she was awake and talking happily on the phone; she was startled to see him, and cut the call short, thinking about what to say, and then said, "That was Mark, we've got tamarisk three fifty-nine to take repet.i.tions of the third salt flusher gene!"

"That's good," he said, moving into the dark kitchen so she wouldn't see his face.

This annoyed her. "You really don't care how my work goes, do you?"

"Of course I do. That's good, I said."

She dismissed that with a noise.

Then one day he got home and Mark was there with her, in the living room, and at a single glance he could see they had been laughing about something; had been sitting closer together than when he started opening the door. He ignored that and was as pleasant as he could be.

The next day as he swam at the morning workout, he watched the women swimming with him in his lane. All three of them had swum all their lives, their freestyle stroke perfected beyond the perfection of any dance move ever made on land, the millions of repet.i.tions making their movement as unconscious as that of any fish in the sea. Under the surface he saw their bodies flowing forward, revealing their sleek lines-cla.s.sic swimmer lines, like Selena's-rangy shoulders tucking up against their ears one after the other, ribcages smoothed over by powerful lats, b.r.e.a.s.t.s flatly merged into big pecs or else bobbing left then right, as the case might be; bellies meeting high hipbones accentuated by the high cut of their swimsuits, backs curving up to bottoms rounded and compact, curving to powerful thighs then long calves, and feet outstretched like ballerinas'. Dance was a weak a.n.a.logy for such beautiful movement. And it all went on for stroke after stroke, lap after lap, until he was mesmerized beyond further thought or observation; it was just one aspect of a sensually saturated environment.

Their current lane leader was pregnant, yet swimming stronger than any of the rest of them, not even huffing and puffing during their rest intervals, when Smith often had to suck air-instead she laughed and shook her head, exclaiming, "Every time I do a flip turn he keeps kicking me!" She was seven months along, round in the middle like a little whale, but still she fired down the pool at a rate none of the other three in the lane could match. The strongest swimmers in the club were simply amazing. Soon after getting into the sport, Smith had worked hard to swim a hundred-meter freestyle in less than a minute, a goal appropriate to him, and finally he had done it once at a meet and been pleased; then later he heard about the local college women's team's workout, which consisted of a hundred hundred-meter freestyle swims, all on a minute interval all on a minute interval. He understood then that although all humans looked roughly the same, some were stupendously stronger than others. Their pregnant leader was in the lower echelon of these strong swimmers, and regarded the swim she was making today as a light stretching-out, though it was beyond anything her lane mates could do with their best effort. You couldn't help watching her when pa.s.sing by in the other direction, because despite her speed she was supremely smooth and effortless, she took fewer strokes per lap than the rest of them, and yet still made substantially better time. It was like magic. And that sweet blue curve of the new child carried inside.

Back at home things continued to degenerate. Selena often worked late, and talked to him less than ever.

"I love you," he said. "Selena, I love you."

"I know."

He tried to throw himself into his work. They were at the same lab, they could go home late together. Talk as they used to about their work, which though not the same, was still genomics in both cases; how much closer could two sciences be? Surely it would help to bring them back together.

But genomics was a very big field. It was possible to occupy different parts of it, no doubt about that. They were proving it. Smith persevered, however, using a new and more powerful tracking microscope, seeing things atom by atom, and he began to make some headway in unravelling the patterns in his fossilized DNA.

It looked as if what had been preserved in the samples he had been given was almost entirely what used to be called the junk DNA of the creature. In times past this would have been bad luck, but the Kohl labs in Acheron had recently been making great strides in unravelling the various purposes of junk DNA, which proved not to be useless after all, as might have been guessed. Their breakthrough consisted of characterizing very short and scrambled repet.i.tive sequences within junk DNA that could be demonstrated to code instructions for higher hierarchical operations than they were used to seeing at the gene level-cell differentiation, information order sequencing, apoptosis and the like.

Using this new understanding to unravel any clues in partially degraded fossil junk DNA would be hard, of course. But the nucleotide sequences were there in his images-or, to be more precise, the characteristic mineral replacements for the adenine-thymine and cytosine-guanine couplets, replacements well-established in the literature, were there to be clearly identified. Nanofossils, in effect; but legible to those who could read them. And once read, it was then possible to brew identical sequences of living nucleotides, matching the originals of the fossil creature. In theory one could re-create the creature itself, though in practice nothing like the entire genome was ever there, making it impossible. Not that there weren't people trying anyway with simpler fossil organisms, either going for the whole thing or using hybrid DNA techniques to graft expressions they could decipher onto living templates, mostly descendants of the earlier creature.

With this particular ancient dolphin, almost certainly a freshwater dolphin (though most of these were fairly salt-tolerant, living in river-mouths as they did), complete resuscitation would be impossible. It wasn't what Smith was trying to do anyway. What would be interesting would be to find fragments that did not seem to have a match in the living descendants' genome, then hopefully synthesize living in-vitro fragments, clip them into contemporary strands, and see how these experimental animals did in hybridization tests and in various environments. Look for differences in function.

He was also doing mitochondrial tests when he could, which if successful would permit tighter dating for the species' divergence from precursor species.

He might be able to give it a specific slot on the marine mammal family tree, which during the early Pliocene was very complicated.

Both avenues of investigation were labour-intensive, time-consuming, almost thoughtless work-perfect, in other words. He worked for hours and hours every day, for weeks, then months. Sometimes he managed to go home on the tram with Selena; more often he didn't. She was writing up her latest results with her collaborators, mostly with Mark. Her hours were irregular. When he was working he didn't have to think about this; so he worked all the time. It was not a solution, not even a very good strategy-it seemed to be making things worse-and he had to attempt it against an ever-growing sense of despair and loss; but he did it nevertheless.

"What do you think of this Acheron work?" he asked Frank one day at work, pointing to the latest print-out from the Kohl lab, lying heavily annotated on his desk.

"It's very interesting! It makes it look as if we're finally getting past the genes to the whole instruction manual."

"If there is such a thing."

"Has to be, right? Though I'm not sure the Kohl labs' values for the rate at which adaptive mutants will be fixed are high enough. Ohta and Kimura suggested ten percent as the upper limit, and that fits with what I've seen."

Smith nodded, pleased. "They're probably just being conservative."

"No doubt, but you have to go with the data."

"So-in that context-you think it makes sense for me to pursue this fossil junk DNA?"

"Well, sure. What do you mean? It's sure to tell us interesting things."

"It's incredibly slow."

"Why don't you read off a long sequence, brew it up and venter it, and see what you get?"

Smith shrugged. Whole-genome shotgun-sequencing struck him as slipshod, but it was certainly faster. Reading small bits of single-stranded DNA, called expressed sequence tags, had quickly identified most of the genes on the human genome; but it had missed some, and it ignored even the regulatory DNA sequences controlling the protein-coding portion of the genes, not to mention the junk DNA itself, filling long stretches between the more clearly meaningful sequences.

Smith expressed these doubts to Frank, who nodded, but said, "It isn't the same now that the mapping is so complete. You've got so many reference points you can't get confused where your bits are on the big sequence. Just plug what you've got into the Lander-Waterman, then do the finishing with the Kohl variations, and even if there are ma.s.sive repet.i.tions, you'll still be okay. And with the bits you've got, well they're almost like ESTs anyway, they're so degraded. So you might as well give it a try."

Smith nodded.

That night he and Selena trammed home together. "What do you think of the possibility of shotgun-sequencing in-vitro copies of what I've got?" he asked her shyly.