Hooke kept a square of black velvet outside so that it would stay cold. When it snowed during the daytime, he would take his microscope outside and spread the velvet out on the stage and peer at any snowflakes that happened to fall on it. Daniel saw, as Hooke did, that each one was unique. But again Hooke saw something Daniel missed: “in any particular snowflake, all six arms are the same-why does this happen? Why shouldn’t each of the six arms develop in a different and unique shape?”

“Some central organizing principle must be at work, but-?” Daniel said.

“That is too obvious to even bother pointing out,” Hooke said. “With better lenses, we could peer into the core of a snowflake and discover that principle at work.”

A week later, Hooke opened up the thorax of a live dog and removed all of its ribs to expose the beating heart. But the lungs had gone flaccid and did not seem to be doing their job.

The screaming sounded almost human. A man with an expensive voice came down from John Comstock’s house to enquire about it. Daniel, too bleary-eyed to see clearly and too weary to think, took him for a head butler or something. “I shall write an explanation, and a note of apology to him,” Daniel mumbled, looking about for a quill, rubbing his blood-sticky hand on his breeches.

“To whom, prithee? asked the butler, amused. Though he seemed young for a head-butler. In his early thirties. He was in a linen night-dress. His scalp glistered with a fine carpet of blond stubble, the mark of a man who always wore a periwig.

“The Earl of Epsom.”

“Why not write it to the Duke of York?”

“Very well then, I’ll write it to him.”

“Then why not dispense with writing altogether and simply tell me what the hell you are doing?”

Daniel took this for insolence until he looked the visitor in the face and realized it was the Duke of York in person.

He really ought to bow, or something. Instead of which he jerked. The Duke made a gesture with his hand that seemed to mean that the jerk was accepted as due obeisance and could they please get on with the conversation now.

“The Royal Society-” Daniel began, thrusting that word Royal out in front of him like a shield, “has brought a dead dog to life with another’s blood, and has now embarked on a study of artificial breath. ”

“My brother is fond of your Society,” said James, “or his Society I should say, for he made it Royal.” This, Daniel suspected, was to explain why he was not going to have them all horsewhipped. “I do wonder at the noise. Is it expected to continue all night?”

“On the contrary, it has already ceased,” Daniel pointed out.

The Lord High Admiral preceded him into the kitchen, where Hooke and Wilkins had thrust a brass pipe down the dog’s windpipe and connected it to the same trusty pair of bellows they’d used to make the dead man’s head speak. “By pumping the bellows they were able to inflate and deflate the lungs, and prevent the dog from asphyxiating,” explained Charles Comstock, after the experimenters had bowed to the Duke. “Now it only remains to be seen how long the animal can be kept alive in this way. Mr. Waterhouse and I shall spell each other at the bellows until Mr. Hooke pronounces an end to the experiment.”

At the mention of Daniel’s family name, the Duke flicked his eyes towards him for a moment.

“If it must suffer in the name of your inquiry, thank Heaven it does so quietly,” the Duke remarked, and turned to leave. The others would follow; but the Duke stopped them with a “Do carry on, as you were.” But to Daniel he said, “A word, if you please, Mr. Waterhouse,” and so Daniel escorted him out onto the lawn half wondering whether he was about to be carved up worse than the dog.

A few moments previously, he’d mastered a daft impulse to tackle his royal highness before his royal highness reached the kitchen, for fear that his royal highness would be disgusted by what was going on in there. But he’d not reckoned on the fact that the Duke, young though he was, had fought in a lot of battles, both at sea and on land. Which was to say that as bad as this business with the dog was, the Duke of York had seen much worse done to humans. The R.S., far from seeming like a band of mad ruthless butchers, were dilettantes by his standards. Further grounds (as if any were wanted!) for Daniel to feel queasy.

Daniel really knew of no way to regulate his actions other than to be rational. Princes were taught a thing or two about being rational, as they were taught to play a little lute and dance a passable ricercar. But what drove their actions was their own force of will; in the end they did as they pleased, rational or not. Daniel had liked to tell himself that rational thought led to better actions than brute force of will; yet here was the Duke of York all but rolling his eyes at them and their experiment, seeing naught that was new.

“A friend of mine brought back something nasty from France,” his royal highness announced.

It took Daniel a long time to decrypt this. He tried to understand it in any number of different ways, but suddenly the knowledge rumbled through his mind like a peal of thunder through a coppice. The Duke had said: I have syphilis.

“Shame, that,” Daniel said. For he was not sure, yet, that he had translated it correctly. He must be ever so careful and vague lest this conversation degenerate into a comedy of errors ending with his death by rapier-thrust.

“Some are of the opinion that mercury cures it.”

“It is also a poison, though,” Daniel said.

Which was common knowledge; but it seemed to confirm, in the mind of James Stuart, Duke of York and Lord High Admiral, that he was talking to just the right chap. “Surely with so many clever Doctors in the Royal Society, working on artificial breath and such, there must be some thought of how to cure a man such as my friend.”

And his wife and his children,Daniel thought, for James must have either gotten it from, or passed it on to, Anne Hyde, who had therefore probably given it to the daughters, Mary and Anne. To date, James’s older brother the King had not been able to produce any legitimate children. There were plenty of bastards like Monmouth. But none eligible to inherit the throne. And so this nasty thing that James had brought back from France was really a matter of whether the Stuart dynasty was to survive.

This raised a fascinating side question. With a whole cottage full of Royal Society Fellows to choose from, why had James carefully chosen to speak with the one who happened to be the son of a Phanatique?

“It is a sensitive matter,” the Duke remarked, “the sort of thing that stains a man’s honor, if it is bandied about.”

Daniel readily translated this as follows: If you tell anyone, I’ll send someone round to engage you in a duel. Not that anyone would pay any notice, anyway, if the son of Drake were to level an accusation of moral turpitude against the Duke of York. Drake had been doing such things without letup for fifty years. And so the Duke’s strategy was now plain to Daniel: he had chosen Daniel to hear about his syphilis because if Daniel were so foolish as to spread rumors, no one would hear them above the roar of obloquy produced at all times by Drake. In any case, Daniel would not be able to keep it up for very long before he was found in a field outside of London with a lot of rapier wounds in his body.

“You will let me know, won’t you, if the Royal Society learns anything on this front?” said James, making to leave.

“So that you can pass the information on to your friend? Of course,” Daniel said. Which was the end of that conversation. He returned to the kitchen to get an idea of how much longer the experiment was going to go on.

The answer: longer than any of them really wanted. By the time they were finished, dawn-light was beginning to come in the windows, giving them a premonition of just how ghastly the kitchen was going to look when the sun actually rose. Hooke was sitting crookedly in a chair, shocked and morose, appalled by himself, and Wilkins was hunched forward supporting his head on a smeared fist.