Franz Bopp (1791-1867), who is commonly considered one of the founding fathers of Indo-European comparative grammar, was primarily interested in the origin of grammatical forms, a goal he pursued, from 1816 on, through the analytical comparison of formative processes of inflectional word classes in Sanskrit, Greek, Latín, German, and Persian in a flrst stage (other Indo-European languages were progressively included in his scholarly spectrum). The larger part of Bopp's work was in the field of Sanskrit, but his interest in the grammatical processes active in the unitary mother language (Stammsprache) led him to write the first comparative grammar of Indo-European (published in three volumes over the years 1833-1852); this comprehensive work...