Among our Simla friends who helped to make our time there a happy one I must particularly mention our dear neighbours Rameshwar and hede Dayal, both stalwart supporters of the Indian Institute of Advanced Study since its inception, also our old friends Narottam and Sarala Sahgal, and likewise the Governor of Himachal Pradesh and his wife, Admiral and Mrs Gandhi. Charles Bawden obliged me very much by identifying several of the Mongolian names and terms found in Tibetan rendering in the so-called "secret" life of the Sixth Dalai Lama. After returning to Oxford, Nick Alien and Hugh Richardson very kindly offered comments and encouragement on the final draft, and Jim Benson, Wlodzimierz Brus and Helmut Eimer helped me with points of detail. To all of them I offer my sincerest thanks. The views expressed, however, remain entirely my own.