Despite the prevalent view against Tantricism and Tantric literature, Hindus, in general, are in the grip of this very Tantra in their daily life, customs and usages with all the attendant good and evil. The present work investigates and places before the scholars a dispassionate account of the Tantras in general and Buddhist Tantras in particular. The author traces its origin to primitive magic and its development. Narrating the Rise of Vajrayana and its place of origin, along with the Tantras and Mantras Buddhism has given to the world, he records the accounts of prominent authors. Aims and objects, the leading tenets, the procedure for worship are elaborated together with a description of the Buddhist deities and their Pantheon. The influence of Buddhist Tantraicism on Hinduism is logically evaluated. Contains Index and illustrations.