11/16/2025
In Psychology and Alchemy, Jung elaborates on Mercurius:
When the alchemist speaks of Mercurius, on the face of it he means quicksilver, but inwardly he means the world-creating spirit concealed or imprisoned in matter. The dragon is probably the oldest pictorial symbol in alchemy..It appears as the Ouroboros, the tail-eater. Time and again the alchemists reiterate that the opus proceeds from the one and leads back to the one, that it is a sort of circle like a dragon biting its own tail. Mercurius stands at the beginning and end of the work: he is the prima materia, the caput corvi, the nigredo; as dragon he devours himself and as dragon he dies, to rise again in the lapis. He is the play of colours in the cauda pavonis and the division into the four elements. He is the hermaphrodite that was in the beginning, that splits into the classical brother-sister duality and is reunited in the coniunctio, to appear once again at the end in the radiant form of the lumen novum, the stone. He is metallic yet liquid, matter yet spirit, cold yet fiery, poison and yet healing draught - a symbol uniting all the opposites. (Jung, CW 11 para. 404)