Mercurius is the son of the macrocosm; he is also extolled by the masters of the art as "benedicta viriditas — blessed greenness." Greenness, in the opinion of alchemist Mylius, is "a kind of germination" which "God has breathed into created things" and from which they receive their life.
Von Franz establishes greenness as the alchemical epithet for Mercurius-as-world-spirit, a divine germinal breath that animates all created things and links the Christ-image to Hermetic philosophy.
, C.G. Jung: His Myth in Our Time, 1975thesis