The tria prima, or three principles, is Paracelsus's revolutionary revision of the classical theory of matter. Where Aristotelian philosophy posited four elements (earth, water, air, fire) as the fundamental constituents of all substances, Paracelsus proposed three principles: Sulphur (the combustible principle, associated with inflammability and color), Mercury (the volatile principle, associated with fusibility and volatility), and Salt (the fixed principle, associated with solidity and resistance to fire). Every substance, in the Paracelsian analysis, could be decomposed by fire into these three components, and the balance of the three determined the substance's properties. The tria prima became the foundation of spagyric chemistry, in which analysis by fire replaced the Aristotelian method of qualitative analysis.

The Paracelsian tria prima represented a major departure from the medieval alchemical tradition, which had operated within the Aristotelian four-element framework supplemented by the Sulphur-Mercury theory of metals (in which metals were generated within the earth by the combination of sulphur and mercury in varying degrees of purity). Paracelsus's addition of Salt as a third principle, and his extension of the three-principle theory to all substances rather than metals alone, transformed the theoretical basis of alchemy and laid the groundwork for the development of iatrochemistry, the medical application of chemical knowledge.

Maier's relationship to the Paracelsian tria prima is one of the most contested questions in scholarship on the Atalanta Fugiens. The geometric formula of Emblem XXI, which instructs the reader to derive a circle from a man and woman, then a square, then a triangle, then a circle, appears to invoke three-ness as a structural principle, and some scholars have read the triangle as a direct reference to the tria prima. However, Tilton argues vigorously against this reading, insisting that reducing Emblem XXI to a straightforward Paracelsian formula misses Maier's deeper engagement with Aristotelian elemental transmutation and the Rosarium tradition.

Tilton's argument is that Maier's alchemy is not Paracelsian but belongs to a pre-Paracelsian lineage rooted in the prisca sapientia tradition. Maier organizes his Symbola Aureae Mensae around twelve alchemical nations stretching from ancient Egypt to modern Germany, and the authorities he cites most frequently (the Turba Philosophorum, the Rosarium, the pseudo-Aristotelian Tractatulus) predate Paracelsus by centuries. While Maier was certainly aware of Paracelsian chemistry and engaged with it, Tilton argues that he understood the alchemical art through an older framework in which the four elements, not the three principles, constituted the fundamental categories of analysis.

De Jong's source-critical method supports Tilton's position by demonstrating that the Atalanta Fugiens' mottos and discourses draw overwhelmingly on pre-Paracelsian sources. The Turba's cosmology is based on the four elements and their interactions, and the Rosarium's geometric formula operates within the same framework. Maier's emblem sequence, read through De Jong's identifications, emerges as a work of elemental alchemy rather than Paracelsian spagyrics.

For the modern reader, the tria prima debate illuminates a crucial distinction within the alchemical tradition. Not all alchemists thought the same way about matter, and Maier's position at the intersection of the old Aristotelian-Arabic tradition and the new Paracelsian chemistry makes the Atalanta Fugiens a particularly rich document of this intellectual transition.

Meanings Across Registers

De Jong shows that alchemical terms operate simultaneously across material, medical, spiritual, and cosmological dimensions.

Alchemical

Paracelsus's three principles—Sulphur, Mercury, and Salt—replacing the Aristotelian four elements as the fundamental components of all matter and the basis of spagyric analysis.

Medical

The three physiological principles: Sulphur as vital heat and combustibility, Mercury as fluidity and volatility, Salt as structure and solidity—the Paracelsian diagnostic triad.

Spiritual

Spirit, soul, and body: the tripartite anthropology in which Mercury mediates between the fiery will (Sulphur) and the material vessel (Salt).

Cosmological

The three cosmic principles reflecting the Trinity: the active formative fire (Sulphur), the receptive universal medium (Mercury), and the crystallized manifest world (Salt).