This book gives a comprehensive introduction to Comparative Indo-European Linguistics. It starts with a presentation of the languages of the family (from English and the other Germanic languages, the Celtic and Slavic languages, Latin, Greek and Sanskrit through Armenian and Albanian) and a discussion of the culture and origin of the Indo-Europeans, the speakers of the Indo-European proto-language. The reader is introduced into the nature of language change and the methods of reconstruction of older language stages, with many examples (from the Indo-European languages). A full description is given of the sound changes, which makes it possible to follow the origin of the different Indo-European languages step by step. This is followed by a discussion of the development of all the morphological categories of Proto-Indo-European. The book presents the latest in scholarly insights, like the laryngeal and glottalic theory, the accentuation, the ablaut patterns, and these are systematically integrated into the treatment. The text of this second edition has been corrected and updated by Michiel de Vaan. Sixty-six new exercises enable the student to practice the reconstruction of PIE phonology and morphology.