You had to be able not merely to distill, but also to act as maker of salves, apothecary, alchemist, and craftsman, merchant, humanist, and gardener all in one. You had to be able to distinguish sheep suet from calves’ suet, a victoria violet from a parma violet. You had to be fluent in Latin. You had to know when heliotrope is harvested and when pelargonium blooms, and that the jasmine blossom loses its scent at sunrise.
