Caduceus as a symbol of medicine

(early second millennium ) Before the ancient Romans and Greeks (about 2612 BCE), older representations from Syria and India of sticks and animals looking like serpents or worms are interpreted by some as a direct representation of traditional treatment of dracunculiasis, the Guinea worm disease. While there is ample historical evidence of the use of the Caduceus, or Herald's Staff, to represent Hermes or Mercury (and by extension commerce and negotiation), early evidence of any symbolic association between the Caduceus and medicine or medical practice is scarce and ambiguous. It is likely linked to the alchemical "universal solvent", Azoth, the symbol of which was the caduceus. The Guildhall Museum in London holds a 3rd-century oculist's seal with Caduceus symbols both top and bottom. The seal was apparently used to mark preparations of eye medicine. It is believed likely that rather than being evidence of a medical association per se, this is rather an allusion to the words of the Greek poet Homer who described the Caduceus as "possessing the ability to charm the eyes of men", which relates to the business of an oculist. [...] although these various factors may link Hermes/Mercury, along with his Caduceus, with alchemical medicine, they may just as well link all the other non-medical aspects of alchemy with Hermes/Mercury and the Caduceus". Despite a long tradition of (the tendency of the ancient Greeks to identify foreign deities with their own gods), determination of the equivalence of deities is a complex matter. The role of Hermes in the afterlife was limited to guiding souls of the deceased, whereas the powerful Egyptian god Thoth was truly lord of the underworld and master of death. Together with Osiris, he presided over the panel of forty-two divine judges that assessed the souls of the deceased for reward or punishment in the afterlife. Thoth was at times depicted with two staves encircled by one cobra each, which might well have influenced the iconography of Hermes' caduceus. However, in ancient Egypt the snake staff represented the attribute of a powerful sorcerer, not a merchant or messenger. Compared to Hermes, Thoth was associated much more with magic and with potent actions preserving balance in the divine world, than with the unpredictable whims of a trickster deity. Depictions similar to the caduceus also occurred in bronze age Mesopotamia as devotional emblems for various major or minor deities, or as snakes embodying the deity itself. Ancient examples of attributes similar to the caduceus, or to aspects of Hermes' portfolio of divine roles, include the Sumerian messenger and snake god Nirah, the occasional depictions of the major goddess Innana holding a scepter with two winding snakes (which lacked the wings of a caduceus), and the benevolent Egyptian goddess Wadjet who was often depicted as a winged cobra. If the caduceus was inspired by and adapted from an amalgam of serpent depictions in other cultures, probably with changes in explanatory myths and divine prerogatives, then Greek mythology might well have created an exaggerated impression that the origins of the caduceus were entirely separate from those of the rod of asclepius. From the perspectives of ethnography and literary history, their cultural and iconographic origins were probably deeply entwined as part of the complex and artistically fluid history of snakes as deities or as divine symbols for healing, magic and protective rituals. == Medieval times ==

, 1582 The Caduceus became a symbol of alchemy and pharmacy in medieval Europe. Its first appearance as a medical symbol can be traced back to 1st−4th century CE in oculists' stamps that were found mostly in Celtic areas, such as Gaul, Germany and Britain, which had an engraving of the name of the physician, the name of the special medicine or medical formula and the disease for which the medicine was to be used. Medieval alchemy used the Caduceus to represent preparations containing quicksilver, later known as mercury. Quicksilver (named ) was believed to be the basis of all substances and this element has been represented by the caduceus for many centuries. Based on the medieval European use of the caduceus to signify pharmacy, Bavarian printer Erhard Ratdolt used the caduceus in his medical manuscripts from 1486 CE. Others followed (not uncontroversially, see section Modern times below). Sir William Butts, physician to Henry VIII, was the first physician to adopt it as his emblem. The rod of Asclepius, since the 5th century CE, resurfaced in 1544 CE. A publication of the medical writings of Avicenna, a Persian physician, had it at the frontispiece. ==Modern times==

. Beginning with the 16th century there is limited evidence of the use of the caduceus in what is arguably a medical context. However, this evidence is also ambiguous. In some cases it is clear that the caduceus symbolized wisdom, without any specific medical connotations. This use was adduced by the medical historian (and primary apologist for the use of the caduceus in a medical context) Fielding Garrison to support his argument that the caduceus was used as a symbol of medicine as far back as the 16th century. However, as Walter Friedlander noted, "what Caius used was a non-specific herald's wand, rather than the caduceus of Hermes." In support of this assertion he quotes Caius's own words on why he chose a herald's wand as a symbol, making it clear that he chose it as a symbol of prudence. In support of the idea that the caduceus had a long-standing association with medicine, Garrison also mentioned the fact that the English medical printer Churchill used the symbol as a printer's device, beginning some time around 1844. Friedlander has examined this subject in detail, and shows that Churchill was well aware that the rod of Asclepius was the accepted symbol of medicine. He is, it seems, inclined to think that the adoption of the caduceus in this context probably had something to do with the relation between publishing and the role of Mercury as a messenger and scribe. He notes, however In any case, in Great Britain, as late as 1854, the distinction between the rod of Asclepius and the caduceus as symbols of two very different professions was apparently still quite clear. In his article ''On Tradesmen's Signs of London A.H. Burkitt notes that among the very old symbols still used in London at that time, which were based on associations between pagan gods and professions, "we find Mercury, or his caduceus, appropriate in trade, as indicating expedition. Esculapius, his Serpent and staff, or his cock'', for professors of the healing art". ==Adoption by the US military==

, depicting the Caduceus. (1863) uses the Rod of Asclepius Widespread confusion regarding the supposed medical significance apparently arose as a result of events in the United States that occurred in the second half of the 19th century. (William K. Emerson indicates the insignia was adopted earlier, in 1851). It has been asserted that this was a result of ignorance or misinterpretation regarding the pre-existing designation of the rod of Asclepius by the Surgeon General of the United States for this purpose. Later, in 1871, the Surgeon General designated the caduceus as the seal of the Marine Hospital Service (destined to become the U.S. Public Health Service in 1912). Gershen states that the change was for aesthetic reasons, whereas Friedlander states the caduceus was adopted by the Marine Hospital Service "because of its relationship with merchant seamen and the maritime industry". The editor also points out that the majority of Medical Corps personnel are not even doctors. According to this line of reasoning, the caduceus was never intended to be a symbol of medicine. The inconsistency was noticed several years later by the librarian to the Surgeon General, but for reasons which are not entirely clear, the symbol was not changed. Considerable light is shed on this confusion by an anonymous letter republished by Emerson, a historian of United States Army insignia and uniforms. He indicates that the April 1924 issue of The Military Surgeon printed a review of an earlier article that appeared in the Presse Médicale in which the author stated "There is nothing in history to justify the use of the caduceus as the emblem of the physician [...] it is most unfortunate that the 'confusion' exists." In an anonymous rebuttal contained in a letter to the editor published three months later in The Military Surgeon it was claimed that the late Col. John R. van Hoff was a member of the board that selected the emblem ("if he was not the one who was chiefly instrumental in its adoption"). In the letter to the editor reproduced by Emerson, the anonymous author claims According to this view the caduceus was not intended to be a medical symbol (and, though explained differently, this reflects the view advanced by the editor commenting in The Army and Navy Register of 28 June 1902 discussed above). Nevertheless, after World War I the caduceus was employed as an emblem by both the Army Medical Department and the Navy Hospital Corps. Even the American Medical Association used the symbol for a time, but in 1912, after considerable discussion, the caduceus was abandoned by the AMA and the rod of Asclepius was adopted instead. The Army Medical Department (AMEDD) has included the Rod of Asclepius in its regimental coat of arms since its foundation in 1863. (Although now part of the AMEDD, the Army Medical Corps retains the caduceus for its own plaque and insignia.) The medical insignia of U.S. Air Force uses the rod of Asclepius. ==Contemporary views==

features a rod of Asclepius. ambulance in Ontario, Canada, with a caduceus in an EMS logo Despite widespread acceptance of the caduceus as a medical symbol in the United States, it has been said that the rod of Asclepius has "the more ancient and authentic claim to be the emblem of medicine". Most attempts to defend the caduceus's use in a medical context date from the last quarter of the 19th century through the first quarter of the 20th, and have been characterized as "based on flimsy and pseudo-historical research". On the other hand, it has also been remarked – not without considerable irony – that commercial aims in medicine, especially in the United States of America, make the caduceus an appropriate symbol, at least for some physicians. Others are unapologetic about the association of medicine with commerce, recognizing the importance of "advertising essential for competitive marketing", and suggesting that it is up to individual physicians to choose between the two symbols, based on their own views about what associations are appropriate. The AMA has used the Rod of Asclepius for over a century, and its current logo since 2005. In North America, there are calls to clarify the symbol and to move to a uniform use of the rod of Asclepius. For example, the director of communications of the Minnesota Medical Association is quoted as saying, "If it's got wings on it, it's not really the symbol of medicine; some may find it hard to believe, but it's true. It's something like using the logo for the National Rifle Association when referring to the Audubon Society". However, Andrew Weil, a proponent of alternative medicine, has suggested that the caduceus is appropriate as a medical symbol "because it embodies an esoteric truth that must be grasped to gain practical control over the shifting forces that determine health and illness." ==Notable modern users (as a symbol of medicine)==

• All India Institute of Medical Sciences, New Delhi (established in 1956) • United States Army Medical Corps (but not the US Army Medical Department) • Northern Ireland Ambulance Service logo includes two serpents entwined around the stem of a flaming torch ==See also==