This is a compilation of Eliphas Levi's writings on the 22 Major Arcana of the Tarot and their corresponding Hebrew letters. It includes the Magic Ritual of the Sanctum Regnum , some extracts from the Major Keys and the Clavicles of Solomon and the Editor's Appendix is a large collection of Levi's drawings and diagrams for easy reference. The science of signs begins with the science of letters. Letters are absolute ideas. Absolute ideas are numbers. Numbers are perfect signs. In using ideas with numbers, one can operate upon the ideas like one can operate upon number and arrive at the mathematics of truth. The tarot is the key of letters and numbers... Now, the tarot that we have today ...has come to us from Egypt passing through Judea. The keys of this tarot, in fact, correspond with the letters of the hebraic alphabet, and some of its figures even reproduce the same form of the characters of this sacred alphabet.