It turned out that this animal’s tether was very long indeed, so that it could range over the entire hilltop, provided it did not commit the classic error of getting the rope wound around anything—and it was one of those dogs who was clever enough to avoid that. Having (or so it imagined) chased off the carriage of Newton, Leibniz, et al., it had found employment on the opposite side of the compound, barking at some untoward noises. But now it was coming for them, angling in on their larboard quarter. It faltered as it perceived a choice between going for Newton and Leibniz—who were several paces ahead—or Daniel and the mounted Mohawk. Wisely, it chose the former. Newton and Leibniz, so different in matters of high philosophy, were absolutely the same when it came to being chased across a farm-yard by a huge ravening mastiff. They cheated to the right, and got up against the hedgerow, prepared to clamber over it if they had to—but this was a last resort, at their age. Then they hustled forward, hoping to get out of the tether’s fatal radius. But that tether simply kept uncoiling—just when it looked as if it were about to jerk taut, fresh miles of it would appear, as if by some conjuror’s trick. Newton almost tripped over something, and Leibniz bent down and picked it up: it was a long wooden paddle, chymically gnawed and stained, its handle snapped off at one end, but still a fathom long. For they had drawn nigh the boiler where such implements were used to stir and test the thickening coction. Leibniz waved this find around, sending a message that the dog collected instantly; it broke off the frontal assault and shifted fluidly into a feinting-and-lunging style of flank-attack. Daniel caught up with the others about now, and, passing behind Leibniz’s defense, went to haul Isaac Newton up off the ground. Meanwhile the Mohawk had ridden up behind the dog and was shouting to draw its attack: a plan his mount well understood and little favored, so that this rider must devote all his powers to managing the mental states of the dog on one hand and the horse on the other.