The Siva Samhita (The Sacred Books of the Hindus, V. 15, Pt. 1.)

This is a Sanskrit text on yoga enumerating its concepts and cognate principles. In the five chapters are discussed and elaborated the essentials necessary for the practice of yoga, ways of attaining siddhi, the philosophy of existence, importance of yoga, the spirit, maya or illusion, the microcosm, the functions of the body, the principles of pranayama or breathing, asanas or postures, the Kundalini and its awakening, the various forms of yoga, etc.