Text: Acthna: An invisible, subterrestrial fire, being the matrix from which bituminous substances take their origin, and sometimes producing volcanic eruptions. It is a certain state of the "soul" of the earth, a mixture of astral and material elements, perhaps of an electric or magnetic character. [It is an element in the life of the "great snake" Vasuki, that according to Hindu mythology encircles the world, and by whose movements earthquakes may be produced. The Life of Philippus Theophrastus, Bombast of Hohenheim, Known by the name of Paracelsus and The Substance of His Teachings

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Source: 131