Within the depth-psychology corpus, 'vapor' operates simultaneously as a cosmological, physiological, and psychological concept, drawing on ancient Greek medicine, Renaissance Neoplatonism, and alchemical philosophy. The term names a liminal substance — neither fully corporeal nor purely spiritual — that mediates between body and soul, matter and mind. Ficino, as reconstructed by Thomas Moore, inherits the physicians' definition of spirit as 'a certain vapor of the blood, pure, subtle, hot and lucid,' a formulation that places vapor at the threshold of the sensible and the psychic. James Hillman, reading alchemical sources through Trinick, locates vapor as the 'thick white vapour' medium of the coniunctio, the dissolving agent that dissolves gender polarity and enables psychic conjunction. In von Franz's commentary on the Aurora Consurgens, the Latin equivalence of vapor, spiritus, and anima — 'sic Opus nostrum nihil aliud est quam vapor et aqua' — makes the term axiomatic for alchemical psychology as a whole. Hillman's Anima further identifies the vaporous soul-substance with anima itself: dew, mist, and cool exhalation clustering around psychic concepts of wetness and indirection. Caswell and Onians trace the etymological kinship of Greek thumos with 'smoke and vapor,' grounding psychological concepts of spirit and breath in material volatility. The convergence of these traditions makes vapor a master-trope for the subtle body, the anima-medium, and the transformative middle region of psychic work.
Spirit by the physicians is defined as a certain vapor of the blood, pure, subtle, hot and lucid… Spirit is like a subtle, invisible vapor, therefore not unlike the spirit bubbling out of a glass of champagne
Moore, via Ficino, establishes vapor as the classical medical and Neoplatonic definition of spirit — the subtle, invisible medium that bridges blood, sensation, and soul.
, The Planets Within: The Astrological Psychology of Marsilio Ficino, 1990thesis
Spirit by the physicians is defined as a certain vapor of the blood, pure, subtle, hot and lucid… Spirit is like a subtle, invisible vapor, therefore not unlike the spirit bubbling out of a glass of champagne
The 1982 edition of Moore's text advances the same Ficinian thesis, identifying vapor as the psychophysical mediator between blood, brain, and the interior and exterior senses.
, The Planets Within: The Astrological Psychology of Marsilio Ficino, 1982thesis
The substance in question (the 'medium' of the conjunction), Trinick writes, is a vapor, 'unctuous, yet highly subtilized – a smoke, or fume; that is, an exhaled matter … usually described as a 'thick white vapour.'
Hillman identifies the alchemical vapor as the crucial dissolving medium of the coniunctio, the unctuous white fume that enables conjunction by dissolving the distinct identities of Sol and Luna.
, Alchemical Psychology, 2010thesis
sic Opus nostrum nihil aliud est quam vapor et aqua… hoc autem et spiritum et animam philosophi vaporem appellaverunt
Von Franz's Aurora Consurgens text equates the entire alchemical opus with vapor and water, and reports the philosophers' identification of vapor with both spiritus and anima.
, Aurora Consurgens: A Document Attributed to Thomas Aquinas on the Problem of Opposites in Alchemy, 1966thesis
anima and psyché have more to do with air, the living air of the head… with dew and heavy cool vapor… This vaporous soul substance, like the mists that hang over marshes
Hillman argues that the anima archetype is phenomenologically grounded in vapor and moisture — mist, dew, and cool exhalation — rather than fire, distinguishing it sharply from eros.
, Anima: An Anatomy of a Personified Notion, 1985thesis
Onians not only made the connection between Latin fumus and Greek θυμός but justified it etymologically via Slavic cognates which developed the meanings 'breath' and 'spirit' by way of 'smoke' and 'vapor'
Caswell, summarizing Onians, establishes the etymological lineage from vapor/smoke through breath to spirit as the philological foundation for thumos as a psychological concept.
, A Study of Thumos in Early Greek Epic, 1990supporting
Euripides… makes Iokaste say to Eteokles 'Check thy dread eye and the blasts (πνοαί) of thy thumos'… 'snorting, breathing thumos from their windpipes'
Onians documents the ancient Greek equation of thumos with breath-blasts, showing how vapor, breath, and passionate spirit were understood as continuous physiological and psychological realities.
, The origins of European thought about the body, the mind,, 1988supporting
virgin's milk is the name given to the pure, spiritual, white fume which ascends to the top of the vessel at the first distillation, clouding the receiver with a milkish shadow and moisture
Abraham identifies the alchemical 'virgin's milk' as the white vaporous fume of first distillation, functioning as the mercurial medium of conjunction — a specific form of vapor in the opus.
, A Dictionary of Alchemical Imagery, 1998supporting
the air's heavy, solid kernel is at the same time the spiritus creator which moves over the waters. And just as 'the images of all creatures' are contained in the creative spirit, so all things are imagined or 'pictured' in air 'through the power of fire'
Jung argues that alchemical air, including its vapor-dimension, must be read psychologically as the identity of opposites: the creative spirit containing all images, projecting psychic content into matter.
, Psychology and Alchemy, 1944supporting
The purpose of distillation in alchemy was to extract the volatile substance, or spirit, from the impure body. This process was a psychic as well as a physical experience.
Jung frames alchemical distillation — the extraction of the volatile vapor-spirit from the body — as simultaneously a chemical and a psychological purification process.
, Collected Works Volume 3: The Psychogenesis of Mental Disease, 1907supporting
gold was the only metal that could endure the heat of the fire while retaining its true nature and purity… they were referring to the ultimate fixation of the great spirit, the embodiment of the divine spirit in man made perfect
Abraham's discussion of the refining fire implicitly contextualizes vapor: the volatile spirits driven off by heat are contrasted with the fixed gold, setting the framework within which vapor functions as the impure or transitional spiritual substance.
, A Dictionary of Alchemical Imagery, 1998aside