Which was a reference to a thing he had taken Daniel to see fifty years earlier, on a visit to Grantham, Lincolnshire: an apothecary’s house where Isaac had boarded as a schoolboy. Clarke had dabbled in Alchemy and had filled a side yard of the house with wreckage of his experiments. It was much smaller than what they had just seen, but to young Isaac must have seemed as large, and as glamourous with hazards, and as seething with mystery. In the half-century since, all things Alchemical had become familiar to Isaac; but what he had just seen must have jolted him with the same emotions he had known as a boy making illicit forays into Mr. Clarke’s laboratory.