- Polo's journey now continues through the lofty mountainous region
in the north of Sze-ch'wan.
The dividing range Ta-pa-shan is less in height than the T'sing-ling range,
but with gorges still more abrupt and deep; and it would be an entire
barrier to communication but for the care with which the road, here also,
has been formed. But this road, from Han-chung to Ch'eng-tu fu, is still
older than that to the north, having been constructed, it is said, in the
3rd century B.C. [See supra.] Before that time Sze-ch'wan was a closed
country, the only access from the north being the circuitous route down the
Han and up the Yang-tz'u. (Ibid.)
[Mr. G.G. Brown writes (Jour. China Br. R. As. Soc. xxviii. p. 53):
"Crossing the Ta-pa-shan from the valley of the Upper Han in Shen-si we
enter the province of Sze-ch'wan, and are now in a country as distinct as
possible from that that has been left. The climate which in the north was
at times almost Arctic, is now pluvial, and except on the summits of the
mountains no snow is to be seen. The people are ethnologically
different.... More even than the change of climate the geological aspect is
markedly different. The loess, which in Shen-si has settled like a pall
over the country, is here absent, and red sandstone rocks, filling the
valleys between the high-bounding and intermediate ridges of palaeozoic
formation, take its place.