I-Ching, though he does not furnish statistics, gives a clear conspectus of Buddhist sects as they existed in his time. He starts from the ancient eighteen sects but divides them into four groups or Nikayas. (_a_) The Ârya-Mahâsanghika-nikâya. This comprised seven subdivisions but was apparently the least influential school as it was not predominant anywhere, though it coexisted with other schools in most parts. The Lokottaravâdins mentioned by Hsüan Chuang as existing at Bamiyan belonged to it. They held that the Buddha was not subject to the laws of nature. (_b_) Ârya-Sthavira-nikâya. This is the school to which our Pali Canon belongs. It was predominant in southern India and Ceylon and was also found in eastern Bengal. (_c_) The Ârya-Mûla-sarvâstivâda-nikâya with four subdivisions. Almost all belonged to this school in northern India and it was nourishing in Magadha. (_d_) The Ârya-Sammitîya-nikâya with four subdivisions flourished in Lâṭa and Sindhu. Thus the last three schools were preponderant in southern, northern and western India respectively. All were followed in Magadha, no doubt because the holy places and the University of Nâlandâ attracted all shades of opinion, and Bengal seems to have been similarly catholic. This is substantially the same as Hsüan Chuang's statement except that I-Ching takes a more favourable view of the position of the Sarvâstivâda, either because it was his own school or because its position had really improved. It would seem that in the estimation of both pilgrims the Maha-and Hinayana are not schools but modes in which any school can be studied. The Nikâya[254] or school appears to have been chiefly, though not exclusively, concerned with the rule of discipline which naturally had more importance for Buddhist monks than it has for European scholars. The observances of each Nikâya were laid down in its own recension of the scriptures which was sometimes oral and sometimes in writing. Probably all the eighteen schools had separate Vinayas, and to some extent they had different editions of the other Pitakas, for the Sarvâstivâdins had an Abhidharma of their own. But there was no objection to combining the study of Sarvâstivâdin literature with the reading of treatises by Asanga and Vasubandhu[255] or sutras such as the Lotus, which I-Ching's master read once a day for sixty years. I-Ching himself seems to regard the two Vehicles as alternative forms of religion, both excellent in their way, much as a Catholic theologian might impartially explain the respective advantages of the active and contemplative lives. "With resolutions rightly formed" he says "we should look forward to meeting the coming Buddha Maitreya. If we wish to gain the lesser fruition (of the Hinayana) we may pursue it through the eight grades of sanctification. But if we learn to follow the course of the greater fruition (of the Mahayana) we must try to accomplish our work through long ages."[256]