This book has arisen out of lectures I gave in recent years at the Uni versities of Munich and Regensburg, and it is intended to serve as a textbook for courses in the Philosophy of Language. In my lectures I was able to presuppose that the students had taken an introductory course in logic. Some knowledge of logic will also be helpful in studying this book - as it is almost everywhere else in philosophy -, especially in Section 3. 2, but it is no prerequisite. I would like to give my sincere thanks to Prof. Terrell for his excellent translation of the book, which is based on the second,...