History of Alchemy

 ALCHEMY

By Suzzette Moulin

Gold:  “the metal is so rare that if every grain taken from the earth since time began were melted into a single cube, it would measure less than nineteen yards to a side.  No civilization has attained greatness without it; its loss has toppled empires.  Yet since humans first held the metal’s entrancing shimmer and associated it with the life-giving sun, gold has been treasured far beyond its value as the medium of wealth and power.  It is the metal of gods, fashioned by virtually all cultures into their most revered objects.

“[Gold] artifacts…manifest enlightenment, purity, and immortality.  To the alchemists, who sought to create gold from baser matter, their highest aim was not mere riches, but divinity itself.” (2)

ALCHEMY IS A SYSTEM OF THOUGHT:
ALCHEMY’S BEGINNINGS:
OCCULT KNOWLEDGE LEADING THE WAY TO GOD:
MARIA THE JEWESS:
FROM PHYSICAL SCIENCE TO PHILOSOPHICAL INQUIRY:
ARISTOTLE:
FOUR ELEMENTS:
ASTROLOGY:
ALCHEMISTS PERSECUTED:
PHILOSOPHER’S STONE:
AVICENNA: 
THREE CATEGORIES OF ALCHEMISTS:
EMPEDOCLES AND FOUR ELEMENTS:
THE ESSENCE OF METALS:
JOURNEY OF THE SPIRIT:
REDEMPTIVE GRACE THROUGH ALCHEMY:
PARACELSUS:
ALCHEMY THE BASIS FOR MODERN CHEMISTRY:
HARMONIOUS INTERCONNECTEDNESS:
PHILOSOPHY VERSUS PRAGMATISM:
ALCHEMICAL INFLUENCES:
TRANSMUTATION:
References

ALCHEMY IS A SYSTEM OF THOUGHT:

Alchemy is a paradigm or system of thought that spans the entire Old World with regional dialects that tend to confirm a common origin.(1)  It is an ancient art/science (described by the American Academics Encyclopedia as a pseudoscience) concerned with the transmutation of base metals (the more reactive metals) into gold and with the discovery of both a single cure for all diseases and a way to prolong life indefinitely.

Gold carries an aura of mystical power because it is immutable (incapable of being changed).  Because gold does not rust, tarnish or decay it symbolizes incorruptibility and immortality.  The modern day chemical symbol for gold, Au, is taken from the Latin word meaning “shining dawn”.  To the Hindus it was the mineral light, a physical token of divine intelligence.  To the Incas it was the sweat of the sun.  In pre-Columbian Central and South America the gold used for body adornments was valued for its ability to reflect the brilliance of sunlight and was worn to represent entry into the kingdom of the sun god.  In ancient China the radiance of gold was seen as a manifestation of super-natural omnipotence and eternal spiritual values.  Because of the immutability of gold, objects made from it reinforce an object’s symbolic connection to eternal life.

ALCHEMY’S BEGINNINGS:

Alchemy emerged as a “pseudoscience” in China and in Egypt during the early centuries of this era.  In China it was associated with Taoist philosophy and purported to transmute base metals into gold by use of a “medicine”.  Gold that was produced by transmutation was thought to be a cure for diseases and to prolong life.  The mystical element was always strong in alchemy and with time became more dominant than the physical chemistry so that alchemy in China degenerated into a complex of superstitions.

OCCULT KNOWLEDGE LEADING THE WAY TO GOD:

One of the factors that influenced the paradigm of alchemy in ancient Egypt was the variety of religious creeds found there.  In Alexandria there were followers of the native Egyptian rites, the cults of the Romans, there were many Jewish synagogues and Christianity also exerted its influence with a number of competing sects.  There were also various mystery cults from the East which introduced secret rituals of rebirth and purification and an orientation toward mystical union with God.  Amid all these contrasting religious viewpoints, occult beliefs abounded.  Students of alchemy could adopt ideas from this assortment of creeds.  A strong belief of alchemists was that occult knowledge leads the mind to perfection and saw knowledge as a way to bring gold to God.

For alchemists this belief had practical significance.  To obtain the perfection of gold, they reasoned they had only to free the essence of gold from the base materials that imprisoned it.  They devised a number of procedures to accomplish this process of liberation.

MARIA THE JEWESS:

One laboratory worker in Egypt was a woman referred to as Maria the Jewess.  She lived during the second century A.D. in Alexandria and was known for designing laboratory equipment and using it in original ways.  One of Maria’s inventions, a water bath, is the same double boiler found in kitchens today.  It is still known in Spanish as bano de Maria and in French as bain-marie.  Her main contribution was an apparatus called the kerotakis, used for heating alchemical substances and collecting their vapors, a process now called distillation.  The kerotakis was an airtight vessel with a piece of copper foil at the top.  When the alchemists heated their various compounds of sulfur, arsenic and mercury, the fumes would condense on the foil and the copper tended to change colors, giving the impression that it was taking on the spirit of gold.  For the apparatus to function properly all of its connections had to be vacuum tight.  The use of such containers in the Hermetic arts gave rise to the expression “hermetically sealed”.  Her most complex apparatus was the tribukos which is a 3-beaked alembic.  (An alembic is any vessel used for distillation.)

FROM PHYSICAL SCIENCE TO PHILOSOPHICAL INQUIRY:

The transformation of alchemy from a physical science to a philosophical inquiry began in the Nile basin, the heart of the ancient world’s gold supply, and it stemmed from the sophisticated skills developed by the metalsmiths of Egypt.  The jewelers and goldsmiths of that civilization often doubled as temple priests and court officials.  Their technical skills were astonishing to others and they were seen as wizards.  In some primitive societies the metal worker is often a member of an occult religious society and is seen as a healer.

Alchemy is believed to have had its roots in the practical skill of the craftsmen of ancient Egypt, many of whom acquired great skill in treating metals in such a way as to counterfeit the more costly gold.  Mixed with Greek philosophy, Babylonian astrology, Muslim idealism, Christian mysticism and Aristotlean theory of the composition of matter, the study of metals flourished in the Middle Ages as alchemy and it has handed down to our own time some of the concepts with which it became involved.

ARISTOTLE:

Aristotle and his contemporaries believed that gold was a living substance, that it grew like carrots in the soil, and that lesser metals had a natural tendency to transmute themselves into more valuable substances.  They believed all nature – like the human race – was intent on self-improvement.  In Aristotle’s words “Nature and God are working towards an end, striving for what is perfect”.  Gold, being the most nearly perfect metal, was the obvious end product of these spontaneous changes.  The skilled metalsmith helped nature carry out its work by smelting ores (a basic transmutation), and was seen as the art of using fire to rearrange the elements and make it possibl e to turn base metals into gold and to “grow” more gold by incorporating it into an alloy.  Heat was fundamental to most alchemical experiments and fire was thought of as the sacred facilitator.

FOUR ELEMENTS:

Aristotle taught that all matter was composed of 4 elements:  water, earth, fire and air.  According to his theory different materials found in nature had different ratios of these 4 elements.  Therefore, by proper treatment a base metal changed into gold.  These ideas were further supported by astrological speculations.

ASTROLOGY:

Astrologers believed that celestial bodies – the Sun, the Moon and the Stars – had a profound influence on the activities of humans.  They believed that events in the macrocosm of the natural world were reflected in the human microcosm and vice versa.  Thus, under the proper astrological influences a “perfection” or “healing” of lead into gold might occur, just as the human soul could achieve a perfect state in heaven.  The artisan in a laboratory could perhaps hasten this process by careful nurture and long heating, by “killing” the metal and then “reviving” it into a finer form.

Thus for alchemists to transmute metals effectively the planets had to be in a favorable configuration and they confined their work to particular phases of the moon.  Astrological influences led to ascribing each metal a heavenly body:  e.g., gold to the Sun, silver to the Moon, copper to Venus and iron to Mars.

ALCHEMISTS PERSECUTED:

As in China and later in Western Europe, the alchemical writing in Alexandria became allegorical and confusing.  At the end of the 4th century the destruction of the academy and its library scattered the alchemists from Alexandria to Byzantium, Syria and countries in the Near East.  There they were persecuted by governments and the church as practitioners of black magic. 

PHILOSOPHER’S STONE:

The Arab alchemists modified the Aristotlean concept of 4 elements by postulating that all metals were composed of 2 immediate components:  sulfur and mercury.  They also adopted the Chinese alchemists’ concept of a “philosopher’s stone” – a medicine that could turn a “sick” (base) metal into gold and also act as an elixir of life.  (An elixir is a substance believed to prolong life indefinitely.)

AVICENNA:

One famous Persian alchemist was Avicenna (980-1036), an important physician and proponent of massage therapy for health.  He authored 450 books, among them The Book of Healing and The Canon of Medicine.  He is considered to be the father of modern medicine.  He was interested in the effect of the mind on the body.  He and other Arabian alchemists discovered new chemicals now called alkalies.  What brought Europe out of the Dark Ages was the wide-spread use of soap and glass.  The manufacture of these two products requires the use of alkalies; thus, large scale commercial production o f soap and glass spurred the economy. 

With the fall of Rome, Greek science and philosophy declined in Western Europe.  Close contact with Arabs in Spain in the 11th and 12th centuries brought a new interest in Arabic philosophers, physicians and scientists.  The alchemist became a recognizable figure on the European scene and kings and nobles often supported alchemy in hopes of increasing their resources.  Frequently alchemists who failed to produce the promised gold lost their lives.

THREE CATEGORIES OF ALCHEMISTS:

Alchemists seem to fall into 3 categories.  There were many who saw in the “Hermetic art” a possible way to wealth by means of converting metals to gold for their own enrichment.  This accounts for the fact that many princes and nobles of Europe kept an alchemist in their employment, and frequently in captivity, so that the great secret of transmutation when unlocked should go no further.  Some alchemists, however, were those who investigated nature from much the same curiosity that is the motive of modern scientists.  Others hoped to find a remedy for all ills, or a secret medicine which would produce ageless long life.  And t here were those whose motives were primarily religious in that they believed the physical order of things to be a kind of key to the celestial arrangements of God.

EMPEDOCLES AND FOUR ELEMENTS:

Some of the notions of alchemy were carried over from the Pythagoreans and particularly from Empedocles, who considered all things to be composed of different proportions of 4 basic elements:  Earth, Air, Fire, and Water.  An example of this is a log burning in the grate.  The fire is obviously there, flaming and glowing’ smoke comes out of the wood and vanishes into the air; water bubbles from the grain at the end of the log; and all that is eventually left is ash (the earth element), smaller in both weight and volume than the original log.  The wood has gone, having been dissociated into these 4 elements.

These elements were held by the alchemists to be no more than different forms or manifestations of a single basic matter, and any substance had its own particular properties according to the proportions in which these forms were mixed.  Fire plus Earth gave dryness, Air plus Water endowed things with wetness.  Fire and Air together gave warmth and Earth and Water were seen together in coldness.

THE ESSENCE OF METALS:

The alchemists were particularly fascinated by metals, and the fact that these were found in veins in the earth strongly suggested that they actually grew there like plants, from original seeds.  Many alchemists clearly regarded metals as alive and as immortal, in the sense that one could dissolve them or transmute them without killing them.  There was more to a metal than the qualities endowed by the 4 ancient elements, and to explain the difference a new concept was introduced in the form of Mercury (capital M Mercury) not the modern element Hg, or quicksilver. 

Mercury, or “philosophical mercury” as it has sometimes been called, was said to be the basis of all metals, which only differed from each other in the amounts of specific qualities such as hardness, softness, luster and the like which were added to it.  From this it followed that any metal could in theory be reduced to Mercury, which could then be built up again into gold (or any other metal) by adding the appropriate qualities.  The research of alchemists depended on being able to obtain the Mercury and it was generally believed that it could most easily be obtained from mercury, which contained less in the way of additional qualities than d id other metals.  If from mercury one removed the wetness and fluidity, the color and the heaviness or earthiness, then one would have Mercury in all its naked purity.  Mercury, seen in this way, would appear to be an abstraction, just as roundness is the abstraction remaining if one imagines a rubber ball and divests it of color, texture and rubberiness.  But to the alchemists Mercury was not a mere abstract concept, for they believed that it could be prepared by purification and would be found at the bottom of a crucible once the necessary purgings of a metal had been carried out. 

Mercury was the chief material but not the only one.  Sulfur, (not identical with yellow sulfur, but a “philosophical sulfur” endowing things with color and combustion) and Salt (again, not sodium chloride, but “philosophical salt”, the principle of earthiness endowing metals with solidity and resistance to fire) were two other main materials.  On this theory copper would be a complex of Mercury with an addition of Sulfur (which accounted for the color) whereas iron owed its hardness to a greater proportion of Salt.  These three principle materials or “tria prima”,  Mercury, Sulfur and Salt, were seen by many alchemists as manifestations of the interaction of the 4 elements of Empedocles.

JOURNEY OF THE SPIRIT:

People worked in laboratories and libraries searching for the ingredient that would transmute ordinary matter into gold.  They studied manuscripts and stood before furnaces, stirring up sulfurous powders and evil-smelling potions.  They may have sacrificed health and fortune in the course of this work. And over time the search itself underwent a transformation.  What had begun as a quest for riches changed into a journey of the spirit.  The work of the alchemist began to reach into the highest levels of philosophical inquiry; if gold was matter in its perfect form – a metallic sunshine – then any person who learned to create it would certainly take on the attributes of d ivinity.  The successful alchemist would be wise, powerful and quite possibly immortal.

“The religious overtones of alchemy seem to have come in by two different means.  In the first place, if a man spent his life and fortune in an unsuccessful effort to prepare Mercury and build it into gold, then clearly there was something amiss.  Today a scientist might conclude that his premises were false, but to the alchemist this was virtually inconceivable.  A much more reasonable explanation was that the failure was the will of God, and that the deity had baulked the investigation either because of his dissatisfaction with the moral character or devotions of the experimenter, or because the secrets themselves could only be apprehended by those who were fit to understand their spiritual significance.< SPAN style="mso-spacerun: yes">  An alchemist would therefore have his “oratory” as a complement to his “laboratory”, and surviving prints of alchemists frequently show the chemist at prayer before beginning an experiment.

REDEMPTIVE GRACE THROUGH ALCHEMY:

But there was another and closer connection with religious belief.  If metals were one in essence and differed only in the extent to which they had purity on the one hand or baseness or corruption on the other, they mirrored the situation of man himself.  Gold was the purest, proof against rust and corrosion, its luster undimmed by fire, and able to withstand the attack of all solvents except “aqua regia”.  It was like regenerate man, resplendent and shining with a perfection which could withstand the wiles of the devil and pass unscathed through the fire of hell.  Lead however was fallen, misconceived, easily melted by fire, and so dirty that it marked the fingers – a p arallel indeed to fallen and sinful man.  Granted that lead could be redeemed to pure gold, and that sinful man could be restored to perfection by the grace of God, then the transmutation of metals was something in the nature of a chemical parallel to the redemption of man.  And this suggested that true insight into the nature of redemptive grace might be obtained by achieving the corresponding transformation in metallurgy.”(3)

An alchemist could therefore be viewed as a chemist, a metallurgist and a theologian.

PARACELSUS:

In time alchemy fell into disrepute because of the nefarious character of some of its practitioners.  Practical alchemists turned from trying to make gold to preparing medicinals.  A leader in this movement was a Swiss-German alchemist, Phillippus Aureolus Paracelsus (1493-1531).

Paracelsus “was one of the first to understand the nature of the circulation of blood, which he called the sap of life.  He was among the first physicians to treat epilepsy as a disease and not as a symptom of demonic possession or lunacy.  He made the connection between miner’s lung disease called silicosis and the inhalation of metal vapors.  Until then its victims had been told that their illness was given to them by the mountain spirits as punishment for sins.  He described the causes, symptoms and diagnosis of syphilis and specified the first treatment that relied on precisely measured doses of mercury compounds taken orally by the patient.  (Almost 400 years later, in the 20th century, a similar treatment was still being prescribed.) 

“Paracelsus’s alchemical research in pursuit of the elixir of life also led him to extract the ‘quinta essentia’ of the poppy.  The result was the discovery of laudanum, an opium derivative that he prescribed as a pain killer in the form of “three black pills”.  And by combining alcohol and sulfuric acid, he prepared ether-like drugs that could be used to induce sleep.

“A Renaissance infirmary run according to Paracelsian principles provided its patients with rest, a healthful diet and loving care.

“He was one of the first physicians to stress examination of the patient.  It was considered unnecessary by most physicians of the time who believed all disease was caused by internal imbalances of blood, phlegm and bile.”(2)

Medical chemistry emerged under his influence:  at the same time he was also an advocate of folk remedies.

“Paracelsus believed that each human being, representing the microcosm, was linked to the cosmos, or macrocosm, and that whatever had an effect upon the one would have a similar effect upon the other.  Health emanated from God, the “Great Physician”, and sickness, as Paracelsus saw it, was merely a breakdown in the celestial harmony that normally exists between nature and humankind, or macrocosm and microcosm.  To restore health, the physician had to restore the balance through the use of chemical remedies, which he called arcana.  In these works the physician-alchemist also was compelled to rely on mediation of such influences as the rays of stars and what Paracelsus called vaguely “the breath of the Lord”.”(2)

He believed alchemy to be the foundation of medicine, along with philosophy, astrology and the occult.  He thought the real purpose of alchemy should be to produce medicines rather than to transmute metals.  At the same time, he had a good understanding of the chemistry of metals and believed in transmutation.  He viewed the body as a chemical system whose functioning was governed by vital spirits.  The function of medicine was to restore the body to homeostasis.  He also believed that diseases were cured by arcana, essences prepared by the alchemist by distillation, percolation, extraction and similar operations.  A particular Arcanum should be effective against a particular disease.  This point of view led Paracelsus and his followers to experiment with a wide variety of chemicals, giving rise to medical chemistry and thus enhancing the pharmacopoeias of the 1600’s.

“Paracelsus believed in the Greek concept of the four elements, but he also believed that on another level the cosmos was fashioned from three spiritual substances, the tria prima (Mercury, Sulfur and Salt).  These three substances gave every object its inner essence and outward form….This alchemical trinity defined the human identity as well.  Sulfur embodied the soul, which was seen to be the emotions and desires; Salt represented the body; Mercury epitomized the spirit, comprising imagination, moral judgment, and the higher mental faculties.

“For Paracelsus the connection between these attributes and alchemy was obvious.  Only by understanding the chemical nature of the tria prima could a physician discover the precise arcana needed to cure a specific disease.”(2)  For Paracelsus the goal of alchemy was not to pursue gold but to cure disease.

In the writings of Paracelsus reference is made both to specifics and to a general elixir which he calls “quintessence”:  “The quintessence, then, is a certain matter extracted from all things which Nature has produced, and from everything which has life corporeally in itself, a matter most subtly purged of all impurities and mortality, and separated from all the elements.  From this it is evident that the quintessence is a nature, a force, a virtue, and a medicine, once shut up within things, but now free from any domicile and from all outward incorporation….Now the fact that the quintessence cures all diseases does not arise from temperature, but from an innate property, namely, its great cleanliness and purity, by which, after a wonderful manner, it alte rs the body into its own purity, and entirely changes it.”(1)

He adds that “each disease requires its own special quintessence”, though there are some which can be used for any disease.

ALCHEMY THE BASIS FOR MODERN CHEMISTRY:

Classical scholarship in the 16th century shifted attention away from Aristotlean theory and toward Greek atomism.  The chemical facts that had been accumulated by alchemists as a by-product of their search for gold became the basis for modern chemistry.

“The mid-1600’s stand out as a watershed in the intellectual evolution of Western society.  It was a time when the balance of mainstream intellectual values began to tip away from its enduring dependence on arcane systems such as philosophical alchemy and toward a new outlook shaped by the insights and extraordinary promise of experimental science.  But alchemy’s decline would be gradual, and the epitaph for this ancient tradition would never be fully written.

“The resilience of the Hermetic arts in the face of new scientific knowledge is not altogether surprising.  For at least a century and a half after the death of alchemy’s high priest, Paracelsus, his philosophy was one of the dominant intellectual forces in Europe.  Spurred on by Nicolaus Copernicus’s 16th century explanation of the earth’s planetary system, alchemists came to believe that they were uniquely equipped to decipher a coherent understanding of nature.

HARMONIOUS INTERCONNECTEDNESS:

“In the grand view they contrived, all of life was a harmonious system of correspondences that linked the heavens to the planets, the planets to the earth, the earth to seasonal changes, the seasons to human illness, and illness to chemical medicines.  It seemed entirely likely that in the long run discoveries on earth would not only eliminate human suffering but would also make plain the underlying wisdom of God’s higher laws.  The Paracelsians drew a broad analogy between the creation of the cosmos by the Divine Power and the alchemist’s experiments in the laboratory:  in both cases, the magical agency of fire was called upon to separate the pure from the impure, good from evil, light from darkness and order fro m chaos.  Within this philosophical framework, God was considered the primordial chemist, the alchemist was his disciple and “great work” of the adept was imbued with sacred significance.”(2)  The alchemist’s task was to sort out what bound together the cosmos by studying the universe as a whole and working down to a more detailed understanding of humankind, from macrocosm to microcosm.  “By applying their beliefs and practices at this level, the followers of Paracelsus hoped to begin by finding cures for all illnesses and end by bringing about a spiritual regeneration that would lead to a better world.”(2)

PHILOSOPHY VERSUS PRAGMATISM:

“With alchemists seeking both mundane medical innovations and cosmic revelations, the craft began to come apart at the seams and the inheritors of Paracelsus’s legacy split into several camps.  One group consisted of purists who carried on a search for the spirit of life on the mystical high ground of “chemical philosophy”.  Others gravitated to more pragmatic goals and focused mainly on experimentation in the laboratory.  And – just as in every previous era – there was the unusual assortment of true believers and charlatans preoccupied strictly with physical transmutation of base metals into rare ones and lusting after nothing more than wealth and power.”(2)

The possibility of chemical gold-making was not disproved by scientific evidence until the late 1800’s.  Sir Isaac Newton, 1643-1727, a rational scientist, thought it worthwhile to experiment with it.  The official attitude toward alchemy in the 16th-18th centuries was ambivalent.  “By the end of the 18th century the foundations of modern science were well established and skepticism toward the alchemical arts was becoming pervasive among educated men and women.”(2)

The Art, as alchemy was referred to, posed a threat to the control of a precious metal and was often outlawed.  On the other hand, there were advantages to any ruler who could control gold making.  Newton and his successors along with the well-known 18th century French chemist, Lavoisier, renounced what many at that time considered the most important question of science – the relation of humans to the cosmos.

ALCHEMICAL INFLUENCES:

Many aspects of alchemy are still with us today.  A modern chemist who talks of a flask being “hermetically” sealed is using the name of the father of alchemy, Hermes Trismegistus (thrice-great Hermes), who was said to have communicated the facts of life of the birth of metals by inscribing them on a gigantic emerald slab.  Metallurgists refer to “base metals, using the same word for sinful which was applied through Christian mysticism to those metals which were believed to be held back from being pure and virtuous gold because of baseness in their nature.  A person of integrity may be referred to as “having a heart of gold” – a reference to the belief of the alchemist’s that gold was pure in a mystical and not ju st a metallurgical sense.

Alchemists, animist, Gnostics, naturalists, shamans, Oriental philosophers, etc,. have worked for millennia toward cures based on the life force and primal energy of nature.

The basic belief of alchemy was that there was a unity in all matter, and that the various metals were built of the same actual stuff with different arrangements and proportions of certain qualities.  In case this seems strange, it may be pointed out that modern science has very similar theories, and that they are belief systems rather than matters of experience or actual fact.  Modern physics describes the atoms of the various elements in terms of different arrangements of certain electrical charges, and biologists try to find a unity between phenomena of life and the world of the physicist by postulating that the arrangement of atoms in protein molecules is the thing that counts.  Certain biologists are just as engrossed in the pursuit of trying to arrange molecules in such a way that they will be alive as were the alchemists in their obsession to separate out the base attributes of lead or tin and convert them to the purity of gold.  When scientists talk about photography of the aura, fields of energy around plants and crystals, and the geological intuitions of a dowser, it seems that alchemy has more to offer than chemistry.  This is not to say that modern scientists are mistaken, but merely to emphasize that the existence of a unifying principle has been the goal of alchemist and scientist alike, and that this unifying principle itself is a matter of belief, as philosophical postulate, a paradigm.

TRANSMUTATION:

Transmutation is the key word characterizing alchemy and it may be understood in several ways:  in chemical changes, in physiological changes such as passing from sickness to health and in a hoped-for transformation from old age to youth, or even in passing from an earthly to a supernatural existence.  Alchemical changes seem always to have been positive, never involving degradation except as an intermediate stage in a process having a positive end.  Alchemy aimed at wealth, longevity and immortality. 

References

  1. Richard Grossinger, “Planet Medicine:  From Stone Age Shamanism to Post-Industrial Healing” Boulder:  Shambhala, 1982    

  2. Editors of Time-Life Books, “Secrets of the Alchemists” Alexandria:  Time-Life Books, 1990.
  3. Roger Pilkington, “Robert Boyle; Father of Chemistry: London:  John Murray, 1959.
  4. Aaron John Ihde, “The development of Modern Chemistry” New York;       Harper & Row, 1964.

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