As the chemical science (in alchemy, alkimia, al is the Arabic article prefixed to the Greek χημεία) has come to us from the Arabs (Syrians, Jews, etc.) it was long believed that it had an Arabian origin. Yet it was found later that the Arabs, while they added much of their own to it, still were but the preservers of Greek-Hellenistic knowledge and we are convinced that the alchemists were right when they indicated in their traditions the legendary Egyptian Hermes as their ancestor. This legendary personage is really the Egyptian god Thoth, who was identified with Hermes in the time of the Ptolemies. He was honored as the Lord of the highest wisdom and it was a favorite practice to assign to him the authorship of philosophical and especially of theological works. Hermes’ congregations were formed to practice the cult, and they had their special Hermes literature.(2) In later times the divine, regal, Hermes figure was reduced to that of a magician. When I speak, in what follows, of the hermetic writings I mean (following the above mentioned traditions) the alchemic writings, with, however, a qualification which will be mentioned later. The idea of the production of gold was so dominant in alchemy that it was actually spoken of as the gold maker’s art. It meant the ability to make gold out of baser material, particularly out of other metals. The belief in it and in the transmutability of matter was by no means absurd, but rather it must be counted as a phase in the development of human thought. As yet unacquainted with the modern doctrine of unchangeable elements they could draw no other conclusion from the changes in matter which they daily witnessed. If they prepared gold from ores or alloys, they thought they had “made” it. By analogy with color changes (which they produced in fabrics, glass, etc.) they could suppose that they had colored (tinctured) the baser metals into gold. Under philosophical influences the doctrine arose that metals, like human beings, had body and soul, the soul being regarded as a finer form of corporeality. They said that the soul or primitive stuff (prima materia) was common to all metals, and in order to transmute one metal into another they had to produce a tincture of its soul. In Egypt lead, under the name Osiris, was thought to be the primitive base of metals; later when the still more plastic quicksilver (mercury) was discovered, they regarded this as the soul of metals. They thought they had to fix this volatile soul by some medium in order to get a precious metal, silver, gold. That problematic medium, which was to serve to tincture or transmute the baser metal or its mercury to silver or gold, was called the Philosopher’s stone. It had the power to make the sick (base) metal well (precious). Here came in the idea of a universal medicine. Alchemy desired indeed to produce in the Philosopher’s Stone a panacea that should free mankind of all sufferings and make men young.