This book attempts to describe firstly, how Buddhism, in a late and strange form, came to Tibet and there developed to suit the needs of an exceptional country and people; and secondly, how, for several centuries and down to the present day, it dominates the Tibetanation. About three-fourth of the material set out in these pages is new; i.e. valuable books and manuscripts given me by the Dalai Lama, the Pan-chen Rim-po-che (Ta-shi Lama), and others, as well as conversations with leading Tibetans in Lhasa and elsewhere. So many are interested in BUddhism, and so little known of the inner working of its Tibetan adaptation, that the subject may perhaps prove acceptable to a circle of readers.