"Etteilla", the pseudonym of Jean-Baptiste Alliette (1 March 1738 – 12 December 1791), was a French occultist who made a significant contribution to the esoteric development of the tarot.

This book presents Etteilla's Philosophie des hautes Sciences or la Clef Donnée aux Enfans de l'Art de la Science & de la Sagesse translated into English for the first time, offering readers unprecedented insight into his system of natural divination outside the realm of cartonomancy for which he is best known.

• The Four Columns of the Wisdom, Science and Art of the Magician - Diviner - Etteilla's foundational method using the Consultant's date of birth, initials, preferred number, and favorite color as the basis for character analysis and divination.

• Numerical and Cabalistic Correspondences - Complete tables showing how letters, colors, and planetary influences relate to human nature and elemental properties, featuring the numerical alphabet system discovered by Etteilla's student Mr. Hisler.

• The 72 Geniuses - A comprehensive catalog of the 72 celestial intelligences governing all aspects of human life, detailing what they love and hate, their elemental qualities, and their domains of influence over the natural world.

• Practical Application - A detailed demonstration showing how to integrate astrology, numerology, color analysis, and angelic correspondences into one unified divination system.

• Letters and Responses - Etteilla's correspondence with students and critics, defending his methods as a natural science and sharing personal insights into his practice.

• Critical Assessment - An Aperçu from a Rigorist on Cartonomancy and On Its Author - Written by Etteilla's skeptical student, this account documents a personal experience with Etteilla's teachings and with the accuracy of his readings.