Daniel could have said, Imagine a barrister watching his moneybags dwindle as he drinks them away, scanning the Strand for a client who’s got the wherewithal to pay his legal bills… but Jeffreys was wearing a sword and was drunk. So he said: “If those planters are in church, and praying, then they’ve already found salvation. Good evening, gentlemen.”

He headed for the Gate, swinging wide round the fountain so that Jeffreys wouldn’t be tempted to run him through. Sir Richard Apthorp was applauding him politely. Jeffreys was mumbling and growling, but after a few moments he was able to get words out: “You are the same man as you were-or weren’t -ten years ago, Daniel Waterhouse! You were ruled by fear then -and you’d have England ruled by it now! Thank God you are sequestered within these walls, and unable to infect London with your disgusting pusillanimity!”

And more in that vein, until Daniel ducked into the vault of the Great Gate of Trinity College. The gate was a hefty structure with crenellated towers at its four corners: a sort of mock-fortress, just the thing for retreating into when under attack by a Jeffreys. Between it and the side-wall of Trinity’s shotgun chapel was a gap in the College’s perimeter defenses about a stone’s throw wide, patched with a suite of chambers that had a little walled garden in front of it, on the side facing towards the town. These chambers had been used to shield various Fellows from the elements over the years, but lately Daniel Waterhouse and Isaac Newton had been living there. Once those two bachelors had moved in their miserable stock of furniture, there had been plenty of unused space remaining, and so it had become the world’s leading alchemical research facility. Daniel knew this, because he had helped build it- was helpingbuild it, rather, for it was perpetually under construction.

Entering his home, Daniel pulled his robes close to his body so that they would not catch fire brushing against the glowing dome of the Reverberatory Furnace, wherein flames curled against the ceiling to strike downwards against the target. Then he pulled his skirts up so they wouldn’t drag against the heap of coal that (though the room was dark) he knew would be piled on the floor to his right. Or, for that matter, the mound of horse dung on the left (when burnt, it made a gentle moist heat). He maneuvered down a narrow lead among stacks of wooden crates, an egglike flask of quicksilver packed into each one, and came round a corner into another room.

This chamber looked like a miniature city, built by outlandish stone-masons, and just in the act of burning down-for each “building” had a peculiar shape, to draw in the air, channel flame, and carry away fumes in a particular way, and each one was filled with flames. Some of them smoked; some steamed; most gave off queer-smelling vapors. Rather than explaining what the place smelled like, ‘twere easier to list what few things could not be smelled here. Lumps of gold lay out on tabletops, like butter in a pastry-shop-it being de rigueur among the higher sort of Alchemists to show a fashionable contempt for gold, as a way of countering the accusation that they were only in it for the money. Not all operations demanded a furnace, and so there were tables, too, sheathed in peened copper, supporting oil-lamps that painted the round bottoms of flasks and retorts with yellow flame.

Smudged faces turned towards Daniel, sequins of perspiration tumbled from drooping eyebrows. He immediately recognized Robert Boyle and John Locke, Fellows of the Royal Society, but, too, there were certain gentlemen who tended to show up at their garden-gate at perverse hours, robed and hooded-as if they really needed to conceal their identities when the King himself was practicing the Art at Whitehall. Viewing their petulant faces by fire-light, Daniel wished they’d kept the hoods on. For, alas, they weren’t Babylonian sorcerers or Jesuit warrior-priests or Druidic warlocks after all, but an unmatched set of small-town apothecaries, bored noblemen, and crack-pated geezers, with faces that were either too slack or too spasmodical. One of them was markedly young-Daniel recognized him as Roger Comstock, he of the so-called Golden Comstocks, who’d been a scholar along with Daniel, Isaac, Upnor, Monmouth, and Jeffreys. Isaac had put Roger Comstock to work pumping a bellows, and the strain was showing on his face, but he was not about to complain. Too, there was a small and very trim raptor-faced man with white hair. Daniel recognized him as Monsieur LeFebure, the King’s Chymist, who’d introduced John Comstock and Thomas More Anglesey and others-including the King himself-to the Art, when they’d been exiled in St.-Germain during the Cromwell years.

But all of these were satellites, or (like Jupiter’s moons) satellites of satellites. The Sun stood at a writing-desk in the center of the room, quill in hand, calmly making notations in a large, stained, yellowed Book. He was dressed in a long splotched smock with several holes burnt through it, though the hem of a scarlet robe could be seen hanging beneath. His head was encased in a sort of leather sack with a windowpane let into it so that he could see out. Where Daniel stood, that rectangle of glass happened to be reflecting an open furnace-door, so instead of the bulging eyes, he saw a brilliant sheet of streaming flame. A breathing-tube, comprising segments of hollow cane plumbed together by the small intestine of some beast, was sewn through the bag. Isaac had tossed it back over his shoulder. It dangled down his back and ran across the floor to Roger Comstock, who pumped fresh air into it with a bellows. So they must be doing something with mercury this evening. Isaac had observed that quicksilver, absorbed into his body, produced effects like those of coffee or tobacco, only more so, and so he used the breathing apparatus whenever he had begun to feel especially twitchy.

The results of some experiment appeared to be cooling down on one of the tables-a crucible hanging in darkness giving off a sullen glow, like Mars-and Daniel reckoned it was as good a time as any to interrupt. He stepped into the middle of the room and held up the bloody rag. “The menstruum of a human female,” he announced, “only a few minutes old!”

A bit melodramatic. But these men thrived on it. Why else would they conceal their persons in wizard-cloaks, and their knowledge in occult signs? Some of them, anyway, were deeply impressed. Newton turned round and glared significantly at Roger Comstock, who cringed and gave the bellows several brisk strokes. The sack around Isaac’s head bulged and whistled. Isaac glared some more. One of the minions rushed up with a beaker. Daniel dropped the moist rag into it. Monsieur LeFebure approached and began to make calm observations in a fifty-fifty French-Latin mix. Boyle and Locke listened politely, the lesser Alchemists formed up in an outer circle, faces strained with the effort of decrypting whatever the King’s Chymist was saying.

Daniel turned the other way to see Isaac peeling the wet sack off his head, then gathering his silver hair and holding it atop his skull to let the back of his neck cool down. He was gazing back at Daniel with no particular emotion. Of course he knew that the rag was just a diversionary tactic, but this did not affect him one way or the other.

“There’s still time to see the second act of the play,” Daniel said. “We’re holding an empty seat for you-practically had to use muskets and pikes to keep scheming Londoners from it.”

“You are taking the position, then, that God placed me on the earth, and in His wisdom supplied me with the resources that He has, so that I could interrupt my work, and spend my hours, watching a wicked atheistical play?”

“Of course not, Isaac, please don’t impute such things to me, not even in private.”