History of Alchemy
The name of alchemy actually covers several philosophical traditions spanning some four millennia and three continents, and their general penchant for cryptic and symbolic language makes it hard to trace their mutual influences and "genetic" relationships.
One can distinguish at least two major strands, which appear to be largely independent, at least in their earlier stages: Chinese alchemy, centered in China and its zone of cultural influence; and Western alchemy, whose center has shifted over the millennia between Egypt, Greece and Rome, the Islamic world, and finally back to Europe. Chinese alchemy was closely connected to Taoism, whereas Western alchemy developed its own philosophical system, with only superficial connections to the major Western religions. It is still an open question whether these two strands share a common origin, or to what extent they influenced each other.
Chinese alchemy
Whereas Western alchemy eventually centered on the transmutation of base metals into noble ones, Chinese alchemy had a more obvious connection to medicine. The philosopher's stone of European alchemists can be compared to the Grand Elixir of Immortality sought by Chinese alchemists. However, in the hermetic view, these two goals were not unconnected, and the philosopher's stone was often equated with the universal panacea; therefore, the two traditions may have had more in common than it initially appears.
Black powder may have been the most important invention of Chinese alchemists. Described in 9th century texts and used in fireworks by the 10th Century, it was used in cannons by 1290. From China, the use of gunpowder spread to Japan, the Mongols, the Arab world and Europe. Gunpowder was used by the Mongols against the Hungarians in 1241, and in Europe starting with the 14th century.
Chinese alchemy was closely connected to Taoist forms of medicine, such as Acupuncture and Moxibustion, and to martial arts such as Tai Chi Chuan and Kung Fu (although some Tai Chi schools believe that their art derives from the Hygienic or Philosophical branches of Taoism, not the Alchemical).
Hindu alchemy
Little is known in the West about the character and history of Hindu alchemy. An eleventh century Iranian alchemist named al-Biruni reported that they "have a science similar to alchemy which is quite peculiar to them. They call it Rasayana. It means the art which is restricted to certain operations, drugs, compounds, and medicines, most of which are taken from plants. Its principles restored the health of those who were ill beyond hope and gave back youth to fading old age."
Alchemy in ancient Egypt
Western alchemists generally traced the origin of their art to Ancient (Pharaonic) Egypt. Metallurgy and mysticism were inexorably tied together in the ancient world, as the transformation of drab ore into shining metal must have seemed to be an act of magic governed by mysterious rules. It is claimed therefore that Alchemy in Ancient Egypt was the domain of the priestly class.
The city of Alexandria in Egypt was a center of alchemical knowledge, and retained its preminence even after the decline of ancient Egyptian culture, through most of the Greek and Roman periods. Unfortunately, practically no original Egyptian documents on alchemy have survived. Those writings, if they existed, were likely lost when the emperor Diocletian ordered the burning of alchemical books after suppressing a revolt in Alexandria (296), which had been a center of Egyptian alchemy. Egyptian alchemy is known mostly through the writings of ancient (Hellenic) Greek philosophers, which in turn have often survived only in Islamic translations.
Legend has it that the founder of Egyptian alchemy was the god Thoth, called Hermes-Thoth or Thrice-Great Hermes (Hermes Trismegistus) by the Greek. According to legend, he wrote what were called the forty-two Books of Knowledge, covering all fields of knowledge — including alchemy. Hermes's symbol was the caduceus or serpent-staff, which became one of many of alchemy's principal symbols. The "Emerald Tablet" or Hermetica of Thrice-Greatest Hermes, which is known only through Greek and Arabic translations, is generally understood to form the basis for Western alchemical philosophy and practice, called the hermetic philosophy by its early practitioners.
The first point of the "Emerald Tablet" tells the purpose of hermetical science: "in truth certainly and without doubt, whatever is below is like that which is above, and whatever is above is like that which is below, to accomplish the miracles of one thing." (Burckhardt, p. 196-7). This is the macrocosm-microcosm belief central to the hermetic philosophy. In other words, the human body (the microcosm) is affected by the exterior world (the macrocosm), which includes the heavens through astrology, and the earth through the elements. (Burckhardt,p. 34-42)
Alchemy in the Greek world
The Greeks appropriated the hermetical beliefs of the Egyptians and melded with them the philosophies of Pythagoreanism, ionianism, and gnosticism. Pythagorean philosophy is, essentially, the belief that numbers rule the universe, originating from the observations of sound, stars, and geometric shapes like triangles, or anything from which a ratio could be derived. Ionian thought was based on the belief that the universe could be explained through concentration on natural phenomena; this philosophy is believed to have originated with Thales and his pupil Anaximander, and later developed by Plato and Aristotle, whose works came to be an integral part of alchemy. According to this belief, the universe can be described by a few unified natural laws that can be determined only through careful, thorough, and exacting philosophical explorations. The third component introduced to hermetical philosophy by the Greeks was gnosticism, a belief prevalent in the pre-Christian and early post-Christian Roman empire, that the world is imperfect because it was created in a flawed manner, and that learning about the nature of spiritual matter would lead to salvation. They further believed that God did not "create" the universe in the classic sense, but that the universe was created "from" him, but was corrupted in the process (rather than becoming corrupted by the transgressions of Adam and Eve, i.e. original sin). According to Gnostic belief, by worshipping the cosmos, nature, or the creatures of the world, one worships the True God. Gnostics do not seek salvation from sin, but instead seek to escape ignorance, believing that sin is merely a consequence of ignorance. Platonic and neo-Platonic theories about universals and the omnipotence of God were also absorbed.
One very important concept introduced at this time, originated by Empedocles and developed by Aristotle, was that all things in the universe were formed from only four elements: earth, air, water, and fire. According to Aristotle, each element had a sphere to which it belonged and to which it would return if left undisturbed. (Lindsay, p. 16)
The four elements of the Greek were mostly qualitative aspects of matter, not quantitative, as our modern elements are. "...True alchemy never regarded earth, air, water, and fire as corporeal or chemical substances in the present-day sense of the word. The four elements are simply the primary, and most general, qualities by means of which the amorphous and purely quantitative substance of all bodies first reveals itself in differentiated form." (Hitchcock, p. 66) Later alchemists extensively developed the mystical aspects of this concept.
Alchemy in the Roman Empire
The Romans adoped Greek alchemy and metaphysics, just as they adopted much of Greek knowledge and philosophy. By the end of the Roman empire the Greek alchemical philosophy had been joined to the hermetical philosophies of the Egyptians. (Lindsay)
However, the development of Christianity in the Empire brought a contrary line of thinking, stemming from Augustine (354-430 CE), an early Christian philosopher who wrote of his beliefs shortly before the fall of the Roman Empire. In essence, he felt that reason and faith could be used to understand God, but experimental philosophy was evil: "There is also present in the soul, by means of these same bodily sense, a kind of empty longing and curiosity which aims not at taking pleasure in the flesh but at acquiring experience through the flesh, and this empty curiosity is dignified by the names of learning and science." (Augustine, p. 245)
Augustinian ideas were decidedly anti-experimental, yet when Aristotelian experimental techniques were made available to the West they were not shunned. Still, Augustinian thought was well ingrained in medieval society and was used to show alchemy as being un-Godly. Ultimately, by the high middle ages, this line of thought created a permanent rift separating alchemy from the very religion that had fostered its birth.
Much of the Roman knowledge of Alchemy, like that of the Greeks and Egyptians, is now lost. In Alexandria, the centre of alchemical studies in the Roman Empire, the art was mainly oral and in the interests of secrecy little was committed to paper. (Whence the use of "hermetic" to mean "secretive".) (Lindsay, p. 155) It is possible that some writing was done in Alexandria, and that it was subsequently lost or destroyed in fires and the turbulent periods that followed.
Alchemy in the Islamic World
After the fall of the Roman Empire, the focus of alchemical development moved to the Middle East. Much more is known about Islamic alchemy because it was better documented: indeed, most of the earlier writings that have come down through the years were preserved as Islamic translations. (Burckhardt p. 46)
The Islamic world was a melting pot for alchemy. Platonic and Aristotelian thought, which had already been somewhat appropriated into hermetical science, continued to be assimilated. Islamic alchemists such as al-Razi (Latin Rasis or Rhazes) contributed key chemical discoveries of their own, such as the technique of distillation (the words alembic and alcohol are of Arabic origin), the muriatic, sulfuric, and nitric acids, soda and potash (alkali), and more. The discovery that aqua regia, a mixture of nitric and muriatic acids, could dissolve the noblest metal — gold — was to fuel the imagination of alchemists for the next millennium.
Islamic philosophers also made great contributions to alchemical hermeticism.
The most influential author in this regard was arguably Jabir Ibn Hayyan (Arabic جابر إبن حيان, Latin Geberus; usually rendered in English as Geber). He analyzed each Aristotelian element in terms of four basic qualities of hotness, coldness, dryness, and moistness. (Burkhardt, p. 29) According to Geber, in each metal two of these qualities were interior and two were exterior. For example, lead was externally cold and dry, while gold was hot and moist. Thus, Jabir theorized, by rearranging the qualities of one metal, a different metal would result. (Burckhardt, p. 29) By this reasoning, the search for the philosopher's stone was introduced to Western alchemy.
It is now commonly accepted that Chinese alchemy influenced Arabic alchemists (Edwards pp. 33-59; Burckhardt, p. 10-22), although the extent of that influence is still a matter of debate. Likewise, Hindu
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