Mystical systems
Tria Prima
Direct answer
Tria Prima: The tria prima are the three principles of Paracelsus, salt, sulphur and mercury, which he held to make up all bodies and matched to body, soul and spirit.
$0 today, then $19/month after 7 days. Cancel anytime.
At a glance
- Also called
- three primes, salt sulphur mercury, three principles of paracelsus, salt sulfur mercury
- Found in
- Mystical Systems
- Related
- Alchemy, Magnum Opus, Prima Materia, Philosopher's Stone
The tria prima are the three principles of Paracelsus, salt, sulphur and mercury, which he held to make up all bodies and matched to body, soul and spirit.
A lineage map for books and systems; it avoids presenting symbolic traditions as literal fact.
Understand the chapter you are in.
Your life’s turning points, measured from your birth.
Walk through Alex’s whole example first
Prefer to explore first?
The Road of AgesThe turning points of your whole life, from your own chart
Walk my road
What are the tria prima?
Tria prima is Latin for the three firsts. Paracelsus taught that every substance is composed of three principles: sulphur, which makes it burn; mercury, which makes it flow and turn to vapour; and salt, which makes it solid and is left as ash. The names are borrowed from the substances but mean kinds of behaviour, not the things themselves.
He applied the three to medicine, holding that illness came from a fault in one principle, and he matched them to the soul, the spirit and the body. Later alchemists and Rosicrucian writers kept the triad as a symbol long after chemistry had set it aside.
On the tree of the hidden arts: Alchemy.
What sets Tria Prima apart
The three are defined by what fire does. Paracelsus's own illustration is a burning stick: the flame is the sulphur, the smoke is the mercury and the ash is the salt. That makes them qualities and not ingredients, which is how a metal, a plant and a human body could all be said to contain them. His novelty was the third term. Salt gave the scheme a body, and made it fit his medicine as well as his metallurgy.
- Language: Latin: the three firsts, or three primes
- Sulphur: the combustible, oily principle; matched to the soul
- Mercury: the volatile, fluid principle; matched to the spirit
- Salt: the fixed, solid principle left as ash; matched to the body
- Earlier scheme: two principles, sulphur and mercury, in the Arabic works under the name Jabir
- Critic: Robert Boyle, The Sceptical Chymist, 1661
Often mistaken for something else: The four elements (fire, air, water, earth) came from Greek philosophy; the tria prima were an alchemical theory added beside them, and many authors used both.
The story behind Tria Prima
Arabic alchemy explained the metals by two principles, sulphur and mercury. Paracelsus (1493 to 1541) added salt and extended the scheme to all bodies and to the human being. Robert Boyle argued against the three principles in The Sceptical Chymist in 1661, pointing out that fire does not reliably divide substances into three.
Why Tria Prima matters
The three principles are the hinge between alchemy and early medicine, and the reason salt appears in later alchemical symbols.
How to read Tria Prima
Readers use the three as a quick picture of balance: what drives a person, how they think, and what keeps them grounded.
Tria Prima in practice: an example
A reader who is all plans and no rest might say their sulphur is high and their salt is neglected.
Where readings of Tria Prima go wrong
They are a way of looking, and say nothing about anyone's health or chemistry.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Mystical Systems
- Aliases
- three primes, salt sulphur mercury, three principles of paracelsus, tria prima alchemy, salt sulfur mercury
- Last updated
- 2026-09-26
See Tria Prima in your personal almanac
A definition tells you what it is; your own birth chart tells you what it means for you. The Oracle casts your real chart and answers for your love, your work, and your year ahead, in conversation. It opens with the 7-day Oracle trial.
Speak with the OracleRelated terms
More in Mystical Systems
From the reference page to your own chart
Every word here
is in your own chart.
- Your life’s turning points, measured from your birth
- A practical next step to consider
- It opens with 7 days free: the AI Oracle on thirty hidden arts, and your daily horoscope
$0 today, then $19/month after 7 days. Cancel anytime.
Common questions
What are the tria prima?
Salt, sulphur and mercury, the three principles Paracelsus said make up every substance. Sulphur is the burning part, mercury the volatile part and salt the solid part left behind.
What do salt, sulphur and mercury stand for?
Paracelsus matched salt to the body, sulphur to the soul and mercury to the spirit. Readers still use the three as a simple picture of a person: ground, drive and mind.
Are the tria prima real chemistry?
No. They were an early theory of matter. Chemistry replaced them with the modern elements, and none of the three principles is an element in that sense.
