2017 Reprint of 1929 Edition. Full facsimile of the original edition, not reproduced with Optical Recognition Software. Originally Published As: “An Essay on the Fundamental Principles of Operative Occultism.” This is an early and illustrated description of the seven spinal chakras and the science of regeneration. Manly P. Hall (1901-1990) founded the Philosophical Research Society in 1934, a non-profit organization dedicated to the dissemination of useful knowledge in the fields of philosophy, comparative religion and psychology. In his long career, spanning more than 70 years of dynamic public activity, Mr. Hall delivered over 8000 lectures in the United States and abroad, authored over 150 books and essays, and wrote countless magazine articles. This is one of Hall’s essays on the art of self-realization, as expressed through the wisdom of the ages.