This small book gives a brief general outline of some of the most important types of mysticism as well as a systematic introduction to Hindu mysticism as it evolved in India throughout the ages. According to the author, mysticism means a spiritual grasp of the aims and problems of life in a much more real manner. The book consists of a Preface and six lectures: Lecture 1: Sacrificial Mysticism; Lecture 2: The Mysticism Of The Upanishads; Lecture 3: Yoga Mysticism; Lecture 4: Buddhistic Mysticism; Lecture 5: Classical Forms Of Devotional Mysticism; and, Lecture 6: Popular Devotional Mysticism.