The doctrine of signatures, dating from the time of Dioscorides and Galen, states that herbs resembling various parts of the body can be used by herbalists to treat ailments of those body parts. A theological justification, as stated by botanists such as William Coles, was that God would have wanted to show men what plants would be useful for.
Eyebright was used for eye infections, owing to the supposed resemblance of its flower to an eye.
Lungwort was thought to have the signature of the lungs and was used to treat lung infections.
Paracelsus, born Theophrastus von Hohenheim, was a Swiss physician, alchemist, lay theologian, and philosopher of the German Renaissance.
The Louvre copy of the lost portrait by Quentin Matsys, source of the iconographic tradition of "fat" Paracelsus
The University of Basel, where Paracelsus started working as a professor in 1527
Monument to Paracelsus in Beratzhausen, Bavaria