A classic text on alchemy by the leading scholar of Jewish mysticism, Gershom Scholem, is presented here for the first time in English translation. Scholem looks critically at the century-old connections between alchemy, the Jewish Kabbalah; its Christianized varieties, such as the gold- and rosicrucian mysticisms, and the myth-based psychology of C. G. Jung, and uncovers forgotten alchemical roots of embedded in the Kabbalah.