Alchemy is the work through which gold and silver are produced without mining them. Its devotees say the first to speak of it was Hermes, the sage of Babel, and that when Babel's people were scattered he moved to Egypt and ruled it as a wise philosopher king. They credit him with a number of books on alchemical science, which he developed through theoretical research into the physical and spiritual properties of things. They also say he instituted the craft of making talismans, and credit him with a number of books on the subject, though the partisans of sempiternity date this craft and its origins to thousands of years before Hermes.
Abu Bakr al-Razi, who is Muhammad ibn Zakariya, says that no philosophical system is valid without a working theory of alchemy, and that no one ignorant of the science of alchemy can be called a philosopher. By this art, he says, the philosopher can do without other people, but they cannot do without the philosopher's scientific and practical insights. Some alchemists say their science was revealed by God, Magnified be His name, to a group of the work's devotees. Others say that God, be He Exalted, revealed it to Moses and Aaron the sons of ‘Imran, peace be upon them, and that they delegated the work to Korah, who enriched himself with gold and silver and waxed tyrannical. God, Blessed and Exalted be He, took note of this, and in answer to Moses's prayer, peace be upon him, He took the life of Korah amidst his treasures.
Al-Razi claims elsewhere that many philosophers were schooled in the work, including Pythagoras, Democritus, Plato, Aristotle, and last of all Galen. Modern authorities have books and teachings on it, as did the ancients, and about these matters God knows best. In summarizing them here, I cannot be blamed, for I do not imitate either group.
On the Bablylonian Hermes. Accounts of him differ. Some say he was one of seven ministers appointed to protect the Seven Houses, with the house of ‘Uṭārid assigned to Hermes. Mercury in the Chaldaean language is named ‘Uṭārid, and by this name Hermes was called. For one reason or another they say he migrated to the land of Egypt, where he was the wisest man of the age, and that he ruled the place and fathered sons there named Ṭāṭ, Ṣā, Ushmun, Athrīb, and Qifṭ. After his death, he was interred at Egypt's capital in a construction called Abū Hirmis, now known as "The Two Pyramids." One pyramid houses Hermes's tomb, and the other his wife's—or, by another account, it is the tomb of the son who succeeded Hermes to Egypt's throne.
From the Fihrist of (Ibn) al-Nadim