In regard to civil conditions in Chinese Turkestan the documents are not much more widely informative than in regard to other matters. The states along the northern trade route, Karashahr, Kuca, Aksu, Kashgar, although from about a.d. 675 they were dominated (not indeed occupied) by the Tibetans, appear to escape all mention; and this is the more regrettable as these states would seem from the culture objects recovered by archæological research to have enjoyed a rather fuller development of material civilization than those south of the desert. Their natural resources were not inferior, they were aligned along a more profitable route of trade and communication, they were less exposed to encroachment of the desert; their archæological remains are more extensive and better preserved. To these states, and to the Wu-sun people of the Tian-shan valleys, we have perhaps—unless the Khu chief (Khu Maṅ-po-rje) of the Tibetan Chronicle is really the Khu ruler of Kao-chang—not a single reference. The twin states of “Anterior” and “Posterior” Chü-shih, i.e. Turfan-Kao-chang and Gu-chen at the extreme east of the Tian-shan, do indeed seem to be indicated as goal of hostile expeditions (1931, pp. 821 sqq.). As has been made clear by Chavannes in Ancient Khotan, pp. 533–6, and Sir Aurel Stein, Innermost Asia, pp. 579–587, they maintained a precarious existence nearly to the end of the eighth century a.d., the Tibetans failing, despite their occupation of Kan-su, to secure possession of them either by diplomatic proposals to China or by force until the year a.d. 790.