The author asks to what extent a knowledge of the concepts of yoga may prepare the way to a better understanding of Indian archaeology. The yoga at the basis of this study is that which forms the core of the Tantras . In the first chapter the author surveys the system of Tantrik yoga. He then continues with a discussion of the various forms of yantras that is all the means employed by yogis in their meditational exercises as aids to the concentration of thought. The author provides in-depth studies of ritual objects of the Lamaistic cult in Tibet and Nepal the sacred cemeteries of Nepal and pantheons in Java and Bali.