I once had to tell a ten-year-old that the Harry Potter book series was not a historical literary classic but a recent publishing phenomenon that occurred in my lifetime. She was amazed, but she wasn’t silly for thinking that the books might date from a faraway past. They do, after all, make frequent reference to figures from centuries when alchemy flourished in Europe, and magicians like Paracelsus and Nicholas Flamel (both of whom appear in Potter books and spin-offs ) who plied their solitary craft, such as it was. Should we call it magic, early science, occult religion, outsider art, or some admixture of the above? We can call it “black magic,” but the term was not, as the Christians thought, a reference to the devil, but to the soil of the Nile. “Derived from the Arabic root ‘kimia,’” writes the Public Domain Review , “from the Coptic ‘khem’ (referring to the fertile black soil of the Nile delta), the word ‘alchemy’ alludes to the dark mystery of the primordial or First Matter...