This is the second book in the 21 Brotherhood of Light Course series by C. C. Zain on the Hermetic Sciences, Astrology, Alchemy, Tarot, Kabbalah and the Occult. In this book the student is introduced to the most important concepts underlying hermetic and occult esoteric studies. These concepts include the importance of the Two Keys to unlocking the mysteries: Astrology and the Tarot; an introduction to basic astrological principles; the mission of the soul struggling to attain Self-Conscious Immortality; the Doctrine of Signatures and the key features of the Tarot, Kabbalah; and facts and fancies about reincarnation. This book, together with Course 1, Laws of Occultism, and Course 3, Spiritual Alchemy, are designed to provide the student with the foundation necessary to delve deeper into occult, esoteric and kabbalistic studies.