” If you wished to voyage the world in a mindflight instant,” writes James Holman’s biographer, “you needed only to step into the Exeter establishment of John Holman, Chymist & Surgeon, close your eyes, and breathe deep the mingled scents of all known continents. It was an apothecary in the very latest mercantile fashion, selling not only medicinal products but just about anything that could be powdered, dried, or otherwise prepared for transport from afar. Cayenne pepper and soy from …