Almost certainly the most detailed and practical work available dealing with two of the most fundamental concepts of Tantra, namely Kundalini and the Chakras. Section 1 outlines all aspects of the theory of Kundalini and its awakening. Section 2 is an in-depth study of the Chakra system. Section 3 systematically outlines the practices involved for working with the Chakras as well as fully detailing the previously unpublished practices of Kriya Yoga. Section 4 concerns itself with scientific and medical research into the subject. An essential work for students of Yoga and Tantra.