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Philosophical tree was a frequently used representation by medieval alchemists of the opus alchymicum. The tree at times was made to represent the various stages of the alchemical process. This could be the prima materia, capable of transforming and refining metals through various stages. In some instances the tree was displayed growing on the earth's crust and others as a tree on an island surrounded by ocean. The tree has seven branches representing the seven planetary metals with its roots and trunk nourish by the mercurial sea. A.G.H
Drury, Nevil. The Watkins Dictionary of Magic. London.
Watkins Publishing. 2005. p. 231