In Japan the whole of Buddhism became the living and active faith of the mass of the people. The present study related to Japanese Buddhism, as in Japan alone the whole of Buddhism has been preserved. Divided into fifteen chapters, the book deals with different schools of Buddhist Philosophy. The author has grouped these schools under two heads: (1) the schools of Negative Rationalism, i.e. the Religion of Dialectic Investigation, and (2) the schools of Introspective Intutitionism, i.e. the Religion of Meditative Experience.