This book is an English version of two series of highly acclaimed introductory lectures given by the great Swiss linguist and classical philologist Jacob Wackernagel (1853-1938) at the University of Basle in 1918-19 on aspects of Greek, Latin, and German as languages. Out of print in German since 1996, these lectures remain the best available introduction, in any language, not only to Greek, Latin, and comparative syntax but also to many topics in the history and pre-history of Greek and Latin, and their relations with other languages. Other subjects, such as the history of grammatical terminology, are also brilliantly dealt with. This new edition supplements the German original by providing a translation of all quotations and examples, a large number of detailed footnotes offering background information and suggestions for further reading, and a single bibliography which brings together Wackernagel's references and those added in the notes.