Mercury — spirit and volatile head
mobile principle
Mercury is the volatile, mobile principle and is rendered here as the spirit-and-breath focus at the head. This is a target-organ projection used to make an alchemical category visible, not a claim that historical spagyrics located a mercury organ in the brain.
Point 1 of 3 in Spagyric Plant Arcanum
Cross-tradition overlaps
No overlapping points are registered for this point.
Sources
Paracelsus, Liber Paragranum (primary_canonical)
Book I sets out sulfur, mercury, and salt as principles of natural bodies; see Book I, the sections on the three principles and the preparation of medicines.
Robert Bartlett, Real Alchemy: A Primer of Practical Alchemy (secondary)
Modern practical account of alchemical operations and the spagyric sequence; see the chapters on plant work and the three principles.