Ignaz Goldziher (1850-1921), a Hungarian scholar, was recognized as one of the outstanding European Islamicists of his time. Presented here for the first time in a scholarly and accurate English translation are six lectures he originally had planned to deliver in America in 1906. Although the lectures were never given, they were published in the original German in 1910 and were translated into many European languages. Since then, this classic work has served as an essential guide for serious students and scholars of Islam.