S. Radhakrishnan’s critical survey traces the history of Indian philosophy from the Rigveda to the theism of Ramanuja, showing both its continuous development and interpreting individual philosophers in the light of this thesis of a single philosophical stream. Volume 1 contains a general introduction to Indian philosophy and covers the period from the Rigveda to Buddhism, including the Upanisads and the theism of the Bhagvad Gita. Volume 2 covers the six Brahmanical systems.