Tria Prima: The Three Primes of Mercury, Sulfur, and Salt

The alchemist is at the furnace. He has heated a mixture of mercury, sulfur, and salt in a sealed glass vessel. The mercury has risen as vapor; the sulfur has ignited; the salt has dissolved. The mixture has gone through a series of colour changes, from the black of the nigredo to the white of the albedo to the red of the rubedo, and the alchemist has observed each change and recorded it in his notebook. He has, in the technical vocabulary of the art, separated, purified, and recombined the three principles. The result is a medicine, and the medicine is supposed to be the most potent preparation the alchemist can make. The theory that the alchemist is working with — the theory that says matter is composed of mercury, sulfur, and salt in different proportions — is the tria prima, the three primes, and the tria prima is the most important theoretical framework of the Western alchemical tradition after the four elements.

The tria prima — the three primes or three principles of mercury, sulfur, and salt — is the most important theoretical framework of the Western alchemical tradition after the four elements. Introduced in the Arabic tradition by Jabir ibn Hayyan and his followers, transmitted to the Latin West through the translation movements of the twelfth and thirteenth centuries, and systematised by Paracelsus and his followers in the sixteenth and seventeenth centuries, the tria prima provided the alchemists with a powerful analytical tool for understanding the composition of matter, the causes of disease, and the alchemical work of transmutation. Principe (The Secrets of Alchemy, 2013, ch. 2), Newman (Promethean Ambitions, 2004, ch. 2), and Holmyard (Alchemy, 1957) are the standard scholarly points of entry.

The origins of the tria prima

The tria prima emerged in the Arabic alchemical tradition, particularly in the vast corpus attributed to Jabir ibn Hayyan (Latinised as Geber). Jabir’s theory built on the Aristotelian theory of the four elements by adding a new level of analysis. The four elements are the primary constituents of matter, but they combine to form three secondary principles — mercury, sulfur, and salt — which are the immediate constituents of the metals and other observable substances. The theory is a sophisticated analytical framework, and the framework is the foundation of the Latin alchemical tradition that the West inherited.

The tria prima theory is a powerful tool. The alchemist can analyse any substance in terms of its mercury, sulfur, and salt, and the analysis gives a precise account of the substance’s behaviour in the laboratory. A substance that is high in mercury is volatile and fluid; a substance that is high in sulfur is combustible and coloured; a substance that is high in salt is fixed and solid. The analysis underwrites the alchemical theory of metallic composition and is the basis of the Paracelsian theory of disease and medicine.

The historical priority of the tria prima is debated, and the debate is the most important piece of the historiography of the theory. Some scholars attribute the theory to Jabir himself; others, following Paul Kraus’s Jābir ibn Hayyān (1942–1943) and the more recent scholarship of the GAS tradition, see the bulk of the corpus as the work of his later followers, the ninth-century “Jabirian community.” What is clear is that the theory is fully developed in the Arabic corpus that the Latin West knew as the “Geberian” tradition, and that it became the standard theoretical framework of the Western alchemical tradition from the thirteenth century on. The Jabirian attribution is a working hypothesis, and the working hypothesis is the right place to leave the question for most purposes.

The three principles

The three primes are not the ordinary substances mercury, sulfur, and salt. They are the principles that the alchemists abstracted from the ordinary substances, and they are present in different proportions in every observable substance. The principles are sometimes called “philosophical mercury,” “philosophical sulfur,” and “philosophical salt” to distinguish them from the ordinary materials, and the distinction is the key to understanding the tria prima on its own terms.

Mercury

In the tria prima theory, mercury is the principle of fusibility, volatility, liquidity, and the spirit. Mercury is the active, masculine principle, associated with the soul, with the celestial heat, and with the planet Mercury. The alchemists identified mercury with the pneuma, the breath or spirit that animates all matter, and they used the symbol of the caduceus, the staff of the messenger god.

In the alchemical theory of metallic composition, mercury is the metallic principle in its purest form. The metals are made of mercury and sulfur in different proportions, and the character of a metal is determined by the balance of the two. Gold is the perfectly balanced metal, in which the mercury is pure and the sulfur is fixed. Lead is the imperfect metal, in which the mercury is impure and the sulfur is contaminated.

Sulfur

Sulfur is the principle of combustibility, colour, the soul, and the masculine. Sulfur is the active, fiery principle, associated with the spirit, with the celestial heat, and with the sun. The alchemists identified sulfur with the anima, the soul of matter, and they used the symbol of a triangle resting on a cross, the alchemical sign for the element of fire.

The metals are made of mercury and sulfur, and the character of a metal is determined by the balance of the two. The alchemist’s work is to purify the sulfur of a base metal, to bring it into harmony with the mercury, and to produce the perfect metal.

Salt

Salt is the principle of solidity, fixity, the body, and the feminine. Salt is the passive, receptive principle, associated with the earth, with the body’s solidity, and with the moon. The alchemists identified salt with the corpus, the body of matter, and they used the symbol of a circle divided by a cross, the alchemical sign for the element of earth and the ancestor of the modern astronomical symbol for Earth.

The principle of salt was a later addition to the tria prima theory, and the addition is one of the most important pieces of the Paracelsian contribution. The earliest form of the theory, attributable to Jabir and his followers, included only mercury and sulfur. The principle of salt was added by Paracelsus and his followers, who argued that the third principle was needed to account for the solidity and the fixed character of the metals (Pagel, Paracelsus, 1958; Principe, 2013, ch. 6). The addition is a genuine theoretical innovation, and the innovation is the reason the Paracelsian version of the tria prima is the version that has survived in the modern spagyric tradition.

The tria prima and the four elements

The tria prima and the four elements are not competing theories; they are two levels of analysis of the same material world. The four elements are the primary constituents; the three principles are the secondary constituents formed by their combination. The alchemist who is analysing a piece of metal can ask first what proportion of the elements it contains, and second what proportion of the principles it contains. The two analyses are complementary.

The alchemists developed a sophisticated scheme of correspondences between the elements and the principles. Mercury is associated with the element of air and water, sulfur with fire, and salt with earth. The scheme is the foundation of the spagyric pharmacology, and the reason the spagyric practitioner can talk about the “salt” of a plant, the “sulfur” of a plant, and the “mercury” of a plant without confusion.

The tria prima and metallic composition

The tria prima theory underwrites the alchemical theory of metallic composition, the foundation of the alchemical theory of transmutation. The metals are made of mercury, sulfur, and salt in different proportions. Gold is the perfect metal, in which the three principles are harmonised. Silver is the perfect metal of the moon, in which mercury predominates. Copper is the metal of Venus, in which sulfur predominates. Lead is the imperfect metal of Saturn, in which salt predominates and the three principles are in disarray.

The differences among metals are differences of balance, and the alchemist can change the balance by adjusting the proportions of the principles. A base metal can be made noble by removing the impurities, by purifying the principles, or by adding a small amount of a perfected agent (the philosopher’s stone) to convert the whole. The theory is the metaphysical foundation of the transmutational project.

The tria prima theory also explains the medical project. Disease is the result of an imbalance of the three principles in the body, and the proper remedies are purified mineral and metallic preparations that can correct the imbalance. The Paracelsian theory of medicine is built on the tria prima. The cluster on spagyric alchemy examines the application in detail.

The tria prima and the Paracelsian revolution

The tria prima theory was the foundation of the Paracelsian medical and alchemical revolution. Paracelsus (1493–1541) adopted the tria prima theory from the Arabic and Latin traditions, but he used it in a new and aggressive way. He argued that the three principles are the immediate constituents of the body, that diseases are the result of imbalances in the three principles, and that the proper remedies are purified mineral and metallic preparations.

Paracelsus’s medical system was a direct application of the tria prima theory. Diseases were classified according to the principle that was out of balance: mercurial diseases (diseases of the spirit and the nervous system), sulfurous diseases (diseases of the soul and the blood), and salty diseases (diseases of the body and the solid tissues). The corresponding remedies were purified preparations of mercury, sulfur, and salt.

The Paracelsian revolution had enormous consequences for the history of medicine and chemistry. The use of mineral remedies — mercury for syphilis, antimony for fevers, and a long list of other mineral preparations — became a major feature of the early modern medical tradition. The spagyric tradition, the practical application of the tria prima theory, became a major part of the early modern pharmaceutical tradition.

The tria prima in the alchemical symbolism

The tria prima is richly represented in the alchemical symbolic tradition, and the symbolism is the most visible inheritance of the theory in the modern alchemical revival. The three principles are each associated with a distinctive symbol, a colour, a planet, and a stage in the magnum opus.

Mercury is represented by the caduceus and by the image of the winged messenger. Its colour is silver, its planet is Mercury, and its stage in the opus is the albedo, the whitening.
Sulfur is represented by a triangle resting on a cross and by the image of the red dragon. Its colour is red, its planet is the Sun, and its stage in the opus is the rubedo, the reddening.
Salt is represented by a circle divided by a cross and by the image of the cubic crystal. Its colour is white or grey, its planet is the Moon, and its stage in the opus is the nigredo, the blackening.

The cluster on alchemical symbols shows the full range of symbols associated with the three principles, and the long-tail page on the color stages treats the stages of the opus in detail.

The tria prima and the spagyric tradition

The tria prima theory underwrites the spagyric tradition, and the underwriting is the reason the theory has been preserved in the modern spagyric revival. The spagyric alchemist analyses a plant or mineral in terms of its mercury, sulfur, and salt, and prepares a medicine by separating, purifying, and recombining the three principles. The goal is a medicine that contains the three principles in perfect balance, more potent than the original substance, that can be used to treat disease and promote longevity.

The spagyric tradition is the practical application of the tria prima theory, and the spagyric remedies are the most lasting contribution of the Paracelsian revolution to the history of medicine. The cluster on spagyric alchemy examines the tradition in detail.

The tria prima and modern chemistry

The tria prima theory was challenged in the seventeenth and eighteenth centuries. Robert Boyle’s Sceptical Chymist (1661) argued that the three principles are not the ultimate constituents of matter, and that chemistry should be based on the careful analysis of substances into their components. Lavoisier’s Traité Élémentaire de Chimie (1789) replaced the tria prima with a new system of elements based on the chemistry of oxygen.

The modern theory of chemistry, with its periodic table of more than one hundred elements, is incompatible with the tria prima theory. The alchemists were wrong about the number and the character of the principles, but their conviction that matter is composed of a small number of basic constituents, and that the differences among substances are differences in the proportions of those constituents, remains a foundational idea of modern chemistry. The tria prima theory, like the four elements theory, was wrong in detail but right in structure, and the structural insight is a major contribution to the history of science. Principe (2013, ch. 1) and Newman (2004, ch. 2) are the right scholarly places to read the modern assessment.

The enduring framework

The tria prima is no longer a part of scientific chemistry, but it remains a useful framework for thinking about the natural world. The theory of the three principles underwrites the Paracelsian medical tradition, the spagyric revival, and much of the contemporary Western esoteric thought. The theory is also a powerful symbolic resource — the caduceus of mercury, the triangle of sulfur, the circle-cross of salt — part of the working vocabulary of the alchemical revival. The alchemical reader who wants to understand the modern spagyric tradition has to understand the tria prima, and the alchemical reader who wants to understand the Paracelsian medical tradition has to understand the tria prima.

FAQ

Q: Did Jabir invent the tria prima? A: The bulk of the Jabirian corpus is now regarded as the work of the later ninth-century “Jabirian community” rather than the historical Jabir (c. 721 – c. 815), following Paul Kraus’s Jābir ibn Hayyān (1942–1943). The tria prima theory is fully developed in the corpus, however, and is the most important Arabic contribution to alchemical matter theory.

Q: Did Paracelsus add salt to the tria prima? A: Yes. The earliest form of the theory, attributable to Jabir and his followers, included only mercury and sulfur. Paracelsus added salt as the third principle to account for the solidity and the fixed character of the metals (Pagel, 1958; Principe, 2013).

Q: Is the tria prima a different kind of theory from the four elements? A: It is a different level of analysis, not a competing theory. The four elements are the primary constituents of matter (Aristotelian framework); the three principles are the secondary, proximate constituents formed by combination of the elements. The two analyses are complementary and were used together by the alchemists.

Q: Did Lavoisier refute the tria prima? A: Yes. Lavoisier’s Traité Élémentaire de Chimie (1789) replaced the qualitative tria prima with a new system of elements based on the chemistry of oxygen. The Sceptical Chymist (1661) had already attacked the tria prima and the four elements, but it was Lavoisier’s quantitative experiments with combustion that made the displacement of the alchemical framework definitive.