CHAPTER XV.

General description of Tibet -- Systems of mountains -- Trans-Sutlej Himalaya -- Cis-Sutlej Himalaya -- Kouenlun -- Four passes across Kouenlun -- Boundaries of Western Tibet -- Height of its mountain ranges and passes -- Climate of Tibet -- Clouds -- Winds -- Snow-fall -- Glaciers -- their former greater extension -- Elevation to which they descend -- Snow-level -- Geology -- Lacustrine clay and alluvium 456

WESTERN HIMALAYA

AND

TIBET.