This volume reprints - with additions and corrections - seven papers originally published 1962-1973, on the indigenous grammars of Tibet and their linguistic tradition. Two ancient treatises commonly attributed to "Thon-mi Sambhota" are studied extensively, as well as extracts from many other Tibetan texts, with translations, commentaries, and detailed bibliographical data, covering a wide range of linguistic doctrines, from the early 11th to the beginning of the 20th century. The final article incorporates a complete grammatical sketch of Classical Tibetan; this, together with the comprehensive indexes of Tibetan and Indic grammatical and technical terms, proper names, titles, etc., will facilitate the use of the volume as a basic reference-source for all future work on the Tibetan grammarians.