Caduceus

The English word caduceus comes from the Latin caduceus, itself derived from the Greek kerukeion (κηρύκειον), the staff of a herald. Mythology recounts that Apollo gave Hermes a golden wand in exchange for the lyre that Hermes had just invented. Hermes used it to separate two serpents in a fight; the reptiles coiled themselves around the staff and remained there. This anecdote is reported by Hyginus (first century) and taken up in Ovid's Metamorphoses. The caduceus served as a diplomatic seal and an insignia of inviolability for Greek ambassadors, and then for the Roman fetiales. The Rod of Asclepius, for its part, derives from another story: Asclepius, son of Apollo, is linked to the serpent as a healing animal.

In the Renaissance, alchemy and Hermeticism took up the caduceus as a symbol of the union of opposites: the two serpents represent the opposing principles (sulfur and mercury, fire and water, masculine and feminine) brought together by the axis of the world that the staff embodies, topped with the wings of the spirit. The historical confusion between the caduceus and the Rod of Asclepius appeared in the nineteenth century, notably in the United States: in 1902, the U.S. Army Medical Corps mistakenly adopted the caduceus as its insignia. The error spread through American pharmacy and medicine in the twentieth century. In France, the caduceus with a single serpent remains correctly used by the Order of Physicians, while pharmacists use the Bowl of Hygieia.

In contemporary esotericism, the caduceus is often compared to the Indian symbol of the kundalini, an energy represented as two serpents coiled around the spine (the nadis Ida and Pingala) rising to the crown of the skull (the wings). This parallel, popularized by the theosophists and notably Charles Webster Leadbeater in The Chakras (1927), has no direct historical foundation but remains evocative. On Tarotoui, the caduceus is found notably in depictions of the Magician card (who channels opposing principles) and in messenger figures of the tarot.

The historian Walter J. Friedlander showed in The Golden Wand of Medicine (1992) how the confusion between the two symbols crystallized in North America through unfamiliarity with the ancient sources. Even today, most American pharmacies and hospitals display a caduceus of Hermes, even though the Rod of Asclepius is the authentic medical symbol recognized by the World Health Organization. This anecdote illustrates the plasticity of symbols, whose meaning derives as much from usage as from origin.