Alchemy Emerald Tablet of Hermes Trismegistus Plate from the 1609 edition of Heinrich Khunrath, Amphitheatrum Sapientiae Aeternae. On the Rock, which is symbolic of the Alchemical Stone, is the text of the famous Emerald Tablet, said to have been written by Hermes (the text begins, in Latin, The words of the Secrets of Hermes....) and in which the secrets of the Alchemical art were supposed to be contained