Be this as it may, even such a sketch as that contained in the preceding pages is sufficient to prove that it is almost impossible to overrate the importance of architecture and its associated arts in elucidating and giving precision to our knowledge of Buddhist history and mythology, from the time when it became the religion of the state till it perished in so far as India was concerned. In the rails at Buddh Gaya and Bharhut, with the eastern caves, we have a complete picture of Buddhism as it existed during the great Mauryan dynasty (B.C. 325 to B.C. 188). At Sanchi and the western caves we have as complete a representation of the form it took from the first century before our era to the third or fourth after it. At Amravati, and from the Gandhara monasteries, we learn what modifications had been introduced before and during the 4th century; and from the Ajunta and later caves we trace its history downward through its period of decay till it became first almost Jaina and then faded away altogether. During the first half of this thousand years we have no contemporary records except those written in stone, and during the latter we have no books we can depend upon; but the architecture, with its sculptures and paintings, remain, and bear the indelible impress of the thoughts, the feelings, and the aspirations of those who executed them, and supply us with a vast amount of exact knowledge on the subject which is not attainable by any other means now known to us. BOOK II. JAINA ARCHITECTURE. CHAPTER I. INTRODUCTORY.