A monumental two-volume translation and commentary on the Tantratattva of ?r?yukta ?iva Chandra Vidy?r?ava Bhatt?c?rya Mahodaya. In Principles of Tantra, Sir John Woodroffe (writing as Arthur Avalon) defends the orthodox ??kta and Tantric traditions against both Western skepticism and Indian reformist critiques. The work explores core Tantric doctrines, ritual practices, the role of the Guru, ?akti worship, and metaphysical principles—making it essential for serious students of Indian esotericism.