In the center of a large room, a surgeon in a red cap and apron kneels to apply a leech to the foot of his bearded patient. Scenes of bloodletting and leechcraft are common in such images of doctors' surgeries. The…

A bald alchemist stands at his furnace on the right, stirring the contents of his crucible while reading a small book. His young apprentice stands by, attentively looking to the alchemist for guidance. Books and other…