The history of the Vedanta school is well known since the time of sankara but its prehistory before sankara is quite obscure. However there is a period of a thousand years between the compilation of the major Uapanisads ot sankara without loss of the tradition of the upanisads there appeared many philosophers and dogmaticians although their thoughts are not clearly known. In a history of early vedanta Philosophy the author made clear the details of the pre sankara vedanta philosophy utilizing not only sanskrit materials but also Pali prakrit as well as Tibetan and Chinese sources. In this respect this epoch making work was awarded the imparial prize by the Japan Academy.
![The exposition of the Vedanta philosophy, by H. T. Colebrooke ... vindicated; a refutation of certain published remarks of colonel Vans Kennedy [in the Asiatic journal].](https://books.google.com/books/content/images/frontcover/U9hSAAAAcAAJ?fife=w150)
