Karl Brugmann originally intended to include a volume on syntax in his comparative grammar of Indo-European, but as that ambitious project expanded, he and his publisher enlisted Berthold Delbrück (1842–1922) to take on the treatment of syntax. Delbrück’s three volumes on inflection and phrase and sentence structure appeared between 1893 and 1900 and remain the fullest treatment of Indo-European syntax to this day. In this final volume, Delbrück again explains that he has not treated the full range of Indo-European languages, nor tried to explain how the attested forms and usages arose. Even so, Delbrück marshalls an impressive range of material as he discusses a comprehensive range of structures from apposition and simple questions to complex sentences involving co-ordination and subordination. The volume ends with thorough indexes of words (100 pages), subjects, literary references, and authors to all three volumes on syntax.