undertook two journeys to Tibet in 1879 and in 1881-1882 Das 1902 (p. vi); on his route, cf. Derek Waller. The Pundits: British Exploration Of Tibet And Central Asia (Lexington, Kentucky: University Press of Kentucky, 1990), p. 198 (map 8).
in 1879 accompanied by lama Ugyen-gyatso Das 1902 (p. vi)
