• Ancient and Modern Initiation
• Rosicrucian Christianity Lectures
• The Rosicrucian Cosmo-Conception
• Freemasonry and Catholicism
• Gleanings of a Mystic
• How Shall We Know Christ at His Coming?
• Letters to Students
• Message of the Stars
• Mysteries of the Great Operas
• Mystical Interpretation of Christmas
• Mystical Interpretation of Easter
• Occult Principles of Health and Healing
• The Rosicrucian Philosophy in Questions and Answers, Volume I
• The Rosicrucian Philosophy in Questions and Answers, Volume II
• The Rosicrucian Mysteries
• Simplified Scientific Astrology
• Teachings of an Initiate
• The Web of Destiny
• Blavatsky and the Secret Doctrine
• Astro-Diagnosis — A Guide to Healing, by Max Heindel and Augusta Foss Heindel
• Astro-Diagnosis — A Guide to Healing Index
• The Desire Body
• The Message of the Stars, by Max Heindel and Augusta Foss Heindel
• Nature Spirits and Nature Forces
• The Passing — Life Afterward
• The Rosicrucian Principles of Child Training
• Encyclopedic Index of Natal and Medical Astrology
• Simplified Scientific Astrology
• The Vital (Etheric) Body

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• KJV Bible
• Bible Self-Study Supplement
• The Kabbalah
• Aquarian Age Stories for Children, by Various Authors
• Astrology and the Ductless (Endocrine) Glands, by August Foss Heindel
• Astrological Keyword System, by J.D.
• The Aquarian Age, by Elsa M.Glover
• Science and Religion, by Elsa M. Glover
• Archetypes
• The Birth of The Rosicrucian Fellowship
• Christ or Buddha?, by Annet C. Rich
• Evolution form the Rosicrucian Standpoint, by Augusta Foss Heindel
• Etheric Vision and What It Reveals, by A Student
• The Work of Invisible Helpers, by Amber M. Tuttle
• Invisible Helpers, by C.W. Leadbeater
• In the Land of the Living Dead, by Prentiss Tucker
• The Mystery of the Ductless (Endocrine) Glands, by A Student
• Reflections of a Rosicrucian Aspirant, by Richard Koepsel
• The Silver Cord and Seed Atoms, by A Student
• Studies in Astrology, by Elman Bacher
• Your Child's Horoscope
• Aquarian Age Stories for Children, by Various Authors
• The Adventures of Rex and Zendah in the Zodiac, by Esme Swainson
• Note: This Index also contains references to other works of Max Heindel and other authors

Ydun, goddess of health, Questions and Answers, Volume II 265, 551

Yellow, is the color or Christ, the Son, Ancient and Modern Initiation 15, Rosicrucian Mysteries 124; is higher color of aura, Freemasonry and Catholicism 58; is indicative of intellect, Freemasonry and Catholicism 60; predominates in average saintly aura, The Web of Destiny 106; produces consciousness, Rosicrucian Mysteries 188

Yggdrasil, is Norse Tree of Life, Christianity Lectures 200; Mysteries of the Great Operas 88

Ymer, is Giant of Northern myths, Ancient and Modern Initiation 80

Yoga, Ancient and Modern Initiation 107; Christianity Lectures 304; Cosmo-Conception 437

Yom Kippur, Ancient and Modern Initiation 37, 59