Cow-Lane joins Holborn near the eastern end of the bridge that Hooke threw over Fleet Ditch some years ago. This is therefore a strategic intersection. If the procession were somehow blocked there by the Mobb, it would have no way of getting across the streaming shit-flume of the Fleet, it would be bottled up, unable to reach the killing-ground. Jack can’t see it, but he knows they’re headed that way, because the earth is tilting beneath the sledge, causing him to recline ever so gently. They are descending Snow Hill. The whole parade should grind to a halt at any moment. But to his surprise they make the turn at the base of the hill without delay, and cross onto the pavers of the bridge. They are halfway across the Fleet Ditch before Jack perceives why: a company of artillery has established a bridgehead there, and set up several cannons, presumably loaded with grapeshot and chains, pointed up Cow-Lane towards Smithfield. A few yards farther along is another battery aimed south along the stony brink of the Ditch, holding back a hundred thousand or so who have formed up there. The Mobb is thus obliged to watch his passage from a remove. Jack stands up in his sledge and waves an arm. Ten thousand people surge to glimpse the great event. It is difficult to guess how many are crushed; but at least a hundred of them are projected over the kerb into the Ditch. Jack sits down, not wishing to be responsible for any more such mayhem. Another score of spectators tumble into the Fleet.

TWELVE GRAINS IS A FORTIETH of an ounce; and gold being the densest thing in the world, a fortieth of an ounce is smaller than a pea. Yet such is the precision of the Goldsmiths’ techniques that they can conduct a reliable assay with so tiny a sample. To take the twelve grains from a single coin would defeat the purpose of the whole undertaking, for such a test might be queered by a freak of chance: a meaningless surplus or deficit of gold in one particular coin. Hence the mixing and sampling that has led to Mr. Threader’s having a dozen guineas set out on the cloth before him. He has come armed with a pair of mighty long-handled snips. He stands up for better leverage, and in short order has cut each of the dozen guineas into halves. He then works his way down the row of twenty-four half-guineas, snipping off their sharp corners. There ought to be forty-eight of these. They are so tiny that they appear to Daniel as points of fire on Threader’s black velvet cloth, echoing the stars painted on the ceiling of this chamber. Like a mad demiurge, Mr. Threader creates a little cosmos crowded with half-moons and strewn stars. He then begins to impose Order on his own Chaos, picking up the halved guineas and setting them to one side, while herding the stars into a globular cluster in the middle. It seems that his old fingers have difficulty picking up the wee bits, for he raises his hand to his mouth once or twice and licks his fingertips, like a scholar who is having difficulty getting traction on a page. Everyone is watching this closely, though Daniel’s mind is a bit distracted still because of that business with Isaac. He turns his head thataway, and notes that the Lord Privy Seal has ventured out of the side chamber where he and all of the great big-wigs are supposed to be awaiting the verdict of the Jury. His lordship has got it into his head that he is going to say hello to Sir Isaac, and turns that way purposefully. But Catherine has read his mind, has tracked his doddering progress, giving him the evil eye the whole way. He’s too blind or careless to notice. She steps into his path. Daniel averts his gaze, not wishing to see the Catastrophe of Manners that’s in the offing.

“Pray, my lord, do not, I beg you,” cries Catherine Barton from the corner of the room. All heads turn that way except for that of Daniel, who is just turning round the other way.

Mr. Threader glances up over his half-glasses, reaches down, and puts the tip of his long finger on a star. When he withdraws his hand, it’s gone-the star has been snuffed out. But another one tumbles to the cloth in its place. This he seizes between thumb and index finger, picks up, and drops upon the little mound that he’s making in the middle. He brings his fingertips to his mouth again to lick them, and Daniel sees a fleck of gold come away on the tip of his tongue and disappear, he supposes, right down Mr. Threader’s epiglottis. Then Mr. Threader rubs his hands together as if they’re chilly-which they probably are. He favors Daniel with a wink.

The crisis in the corner has been sorted out somehow; heads are turning back toward the Pesour. He stands there motionless, hands at his sides, as if he has not moved a muscle during this little contretemps. “Sir Isaac is grown so reclusive of late, one can’t but wonder what it is he’s trying to hide from us!” Mr. Threader remarks, in a clearly audible aside to one of the Goldsmiths. “I daresay all his secrets shall be discovered in a few minutes’ time; he can hide from Lord Privy Seal but not from this.” Nodding at the furnace.

Daniel is by and large a great stifler of urges and hider of feelings; but he knows that this is a cue. “You dog!” he exclaims, and takes half a step forward, reaching around himself, groping for the ridiculous sword he’s hung on himself for the occasion, and half yanking it from its scabbard. In that moment every face in the room turns toward him. Mr. Threader snuffs out another star, lets another one fall from between his fingers, and reloads.

“Dr. Waterhouse,” he says, mumbling a bit, probably because he is in the act of swallowing a bit of a guinea, “my old friend! Are you feeling quite all right?”

“I am no friend of yours, sir!” Daniel cries, and makes to draw the sword all the way out; but then younger and stronger hands are on his arm, and someone has moved to block his path to Mr. Threader. “I am a true friend of Sir Isaac Newton-a man so dedicated, so loyal to his King and to his craft that he has come here to-day in spite of being laid low with illness!” Daniel shoves the sword back in to its sheath, spins, and takes a few paces back into the open space between the Jurors and Miss Barton. All eyes track him except for those of Mr. Threader, who is up to more conjuring. “You would do well to remember, sir, that it is your solemn duty to conduct this assay justly and truly, and in spite of the enmity that your profession bears toward Sir Isaac. The Lords of the Council-” and here Daniel turns to gesture with one hand toward the door of the side chamber. The unfamiliar scabbard swings around and whacks him on the ankle, which gives him an idea-he hooks a toe over it, flails his arms, and tumbles to the floor.

It’s all the Jurors can do not to laugh out loud. But soon enough they are struck dumb by two very different, yet equally mesmerizing sights: first of all Catherine Barton rushing forward and bending down to assist Daniel, so that everyone’s able to stare down her bodice. Second, the Duke of Marlborough striding in from the next room in high dudgeon.

“What in the name of-” he begins, then stops, lost in contemplation of Miss Barton’s cleavage.

“ ’Tis nothing, my lord, if you please, a momentary flaring of warm feelings, as when a log bursts on a hearth, and sparks fly,” says Mr. Threader. “The only sparks that matter to us are these.” He gestures with both hands at the pile of golden bits he has made on the cloth. “If, as I hope, Dr. Waterhouse’s exertions have left him quite uninjured, then I shall weigh out twelve grains of these.”

“I am…fine,” Daniel announces. “Thank you, Miss Barton,” he says, for she’s just hauled him to his feet, and is spanking the dust from him. “I am sorry,” he concludes. “Pray continue, Mr. Threader.”

Working now with a pair of tweezers, Mr. Threader moves granules of gold one by one from the pile of snips to one of the pans of his great Scale. On the opposite pan he places a twelve-grain weight from the set that was stored in the Abbey. After a minute the scale-pans begin to move. The Pesour goes into a protracted and tedious work of swapping larger bits for smaller ones, or sometimes snipping a bit in half to make change, as it were.