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The term Central Asia is here used to denote the Tarim basin, without rigidly excluding neighbouring countries such as the Oxus region and Badakshan. This basin is a depression surrounded on three sides by high mountains: only on the east is the barrier dividing it from China relatively low. The water of the whole area discharges through the many branched Tarim river into Lake Lobnor. This so-called lake is now merely a flooded morass and the basin is a desert with occasional oases lying chiefly near its edges. The fertile portions were formerly more considerable but a quarter of a century ago this remote and lonely region interested no one but a few sportsmen and geographers. The results of recent exploration have been important and surprising. The arid sands have yielded not only ruins, statues and frescoes but whole libraries written in a dozen languages. The value of such discoveries for the general history of Asia is clear and they are of capital importance for our special subject, since during many centuries the Tarim region and its neighbouring lands were centres and highways for Buddhism and possibly the scene of many changes whose origin is now obscure. But I am unfortunate in having to discuss Central Asian Buddhism before scholars have had time to publish or even catalogue completely the store of material collected and the reader must remember that the statements in this chapter are at best tentative and incomplete. They will certainly be supplemented and probably corrected as year by year new documents and works of art are made known.
Tarim, in watery metaphor, is not so much a basin as a pool in a tidal river flowing alternately to and from the sea. We can imagine that in such a pool creatures of very different provenance might be found together. So currents both from east to west and from west to east passed through the Tarim, leaving behind whatever could live there: Chinese administration and civilization from the east: Iranians from the west, bearing with them in the stream fragments that had drifted from Asia Minor and Byzantium, while still other currents brought Hindus and Tibetans from the south.
One feature of special interest in the history of the Tarim is that it was in touch with Bactria and the regions conquered by Alexander and through them with western art and thought. Another is that its inhabitants included not only Iranian tribes but the speakers of an Aryan language hitherto unknown, whose presence so far east may oblige us to revise our views about the history of the Aryan race. A third characteristic is that from the dawn of history to the middle ages warlike nomads were continually passing through the country. All these people, whether we call them Iranians, Turks or Mongols had the same peculiarity: they had little culture of their own but they picked up and transported the ideas of others. The most remarkable example of this is the introduction of Islam into Europe and India. Nothing quite so striking happened in earlier ages, yet tribes similar to the Turks brought Manichæism and Nestorian Christianity into China and played no small part in the introduction of Buddhism.
A brief catalogue of the languages represented in the manuscripts and inscriptions discovered will give a safe if only provisional idea of the many influences at work in Central Asia and its importance as a receiving and distributing centre. The number of tongues simultaneously in use for popular or learned purposes was remarkably large. To say nothing of great polyglot libraries like Tun-huang, a small collection at Toyog is reported as containing Indian, Manichæan, Syriac, Sogdian, Uigur and Chinese books. The writing materials employed were various like the idioms and include imported palm leaves, birch bark, plates of wood or bamboo, leather and paper, which last was in use from the first century A.D. onwards. In this dry atmosphere all enjoyed singular longevity.
Numerous Sanskrit writings have been found, all dealing with religious or quasi religious subjects, as medicine and grammar were then considered to be. Relatively modern Mahayanist literature is abundant but greater interest attaches to portions of an otherwise lost Sanskrit canon which agree in substance though not verbally with the corresponding passages in the Pali Canon and are apparently the original text from which much of the Chinese Tripitaka was translated. The manuscripts hitherto published include Sûtras from the Samyukta and Ekottara Agamas, a considerable part of the Dharmapada, and the Prâtimoksha of the Sarvâstivâdin school. Fa-Hsien states that the monks of Central Asia were all students of the language of India and even in the seventh century Hsüan Chuang tells us the same of Kucha. Portions of a Sanskrit grammar have been found near Turfan and in the earlier period at any rate Sanskrit was probably understood in polite and learned society. Some palm leaves from Ming-Ŏi contain fragments of two Buddhist religious dramas, one of which is the Sâriputra-prakaraṇa of Aśvaghosha. The handwriting is believed to date from the epoch of Kanishka so that we have here the oldest known Sanskrit manuscripts, as well as the oldest specimens of Indian dramatic art[459]. They are written like the Indian classical dramas in Sanskrit and various forms of Prâkrit. The latter represent hitherto unknown stages in the development of Indian dialects and some of them are closely allied to the language of Aśoka's inscriptions. Another Prâkrit text is the version of the Dharmapada written in Kharoshṭhî characters and discovered by the Dutreuil de Rhins mission near Khotan[460], and numerous official documents in this language and alphabet have been brought home by Stein from the same region. It is probable that they are approximately coeval with the Kushan dynasty in India and the use of an Indian vernacular as well as of Sanskrit in Central Asia shows that the connection between the two countries was not due merely to the introduction of Buddhism.
Besides these hitherto unknown forms of Prâkrit, Central Asia has astonished the learned world with two new languages, both written in a special variety of the Brahmi alphabet called Central Asian Gupta. One is sometimes called Nordarisch and is regarded by some authorities as the language of the Śakas whose incursions into India appear to have begun about the second century B.C. and by others as the language of the Kushans and of Kanishka's Empire. It is stated that the basis of the language is Iranian but strongly influenced by Indian idioms[461]. Many translations of Mahayanist literature (for instance the Suvarṇaprabhâsa, Vajracchedikâ and Aparimitâyus Sûtras) were made into it and it appears to have been spoken principally in the southern part of the Tarim basin[462]. The other new language was spoken principally on its northern edge and has been called Tokharian, which name implies that it was the tongue of the Tokhars or Indoscyths[463]. But there is no proof of this and it is safer to speak of it as the language of Kucha or Kuchanese. It exists in two different dialects known as A and B whose geographical distribution is uncertain but numerous official documents dated in the first half of the seventh century show that it was the ordinary speech of Kucha and Turfan. It was also a literary language and among the many translations discovered are versions in it of the Dharmapada and Vinaya. It is extremely interesting to find that this language spoken by the early and perhaps original inhabitants of Kucha not only belongs to the Aryan family but is related more nearly to the western than the eastern branch. It cannot be classed in the Indo-Iranian group but shows perplexing affinities to Latin, Greek, Keltic, Slavonic and Armenian[464]. It is possible that it influenced Chinese Buddhist literature[465].
Besides the "Nordarisch" mentioned above which was written in Brahmi, three other Iranian languages have left literary remains in Central Asia, all written in an alphabet of Aramaic origin. Two of them apparently represent the speech of south-western Persia under the Sassanids, and of north-western Persia under the Arsacids. The texts preserved in both are Manichæan but the third Iranian language, or Sogdian, has a more varied literary content and offers Buddhist, Manichæan and Christian texts, apparently in that chronological order. It was originally the language of the region round Samarkand but acquired an international character for it was used by merchants throughout the Tarim basin and spread even to China. Some Christian texts in Syriac have also been found.
The Orkhon inscriptions exhibit an old Turkish dialect written in the characters commonly called Runes and this Runic alphabet is used in manuscripts found at Tun-huang and Miran but those hitherto published are not Buddhist. But another Turkish dialect written in the Uigur alphabet, which is derived from the Syriac, was (like Sogdian) extensively used for Buddhist, Manichæan and Christian literature. The name Uigur is perhaps more correctly applied to the alphabet than the language[466] which appears to have been the literary form of the various Turkish idioms spoken north and south of the Tien-shan. The use of this dialect for Buddhist literature spread considerably when the Uigurs broke the power of Tibet in the Tarim basin about 860 and founded a kingdom themselves: it extended into China and lasted long, for Sûtras in Uigur were printed at Peking in 1330 and Uigur manuscripts copied in the reign of K'ang Hsi (1662-1723) are reported from a monastery near Suchow[467]. I am informed that a variety of this alphabet written in vertical columns is still used in some parts of Kansu where a Turkish dialect is spoken. Though Turkish was used by Buddhists in both the east and west of the Tarim basin, it appears to have been introduced into Khotan only after the Moslim conquest. Another Semitic script, hitherto unknown and found only in a fragmentary form, is believed to be the writing of the White Huns or Hephthalites.
As the Tibetans were the predominant power in the Tarim basin from at least the middle of the eighth until the middle of the ninth century, it is not surprising that great stores of Tibetan manuscripts have been found in the regions of Khotan, Miran and Tun-huang. In Turfan, as lying more to the north, traces of Tibetan influence, though not absent, are fewer. The documents discovered must be anterior to the ninth century and comprise numerous official and business papers as well as Buddhist translations[468]. They are of great importance for the history of the Tibetan language and also indicate that at the period when they were written Buddhism at most shared with the Bön religion the allegiance of the Tibetans. No Manichæan or Christian translations in Tibetan have yet been discovered.