xvii, 129 pp. CONTENTS: Preface; The Basis of the Inner Teaching; The Material Universe; The Philosopher's Stone; The Law of Creation; Unity and Reality; Yoga and Concentration; Yoga, the Will and Mystic Union; Prana and Yoga Breathing; The Method of Yoga Breathing; Yoga Breathing for Spiritual Devlopment; Yoga Breathing, Its Practical Application; The Nerve Centres, and General Advice.