This book was written for one audience and valued by another. Written to lead adherents of the nascent German liturgical movement to a deeper religious appreciation of Catholic worship, its methodology and scope have won the appreciation of liturgical specialists for nearly a century. In describing the organic growth of the liturgy, its shaping and distortion, Baumstark's reach extends from India to Ireland, Moscow to Axum, Carthage to Xi'an. He discusses the influences of language, literature, doctrine, piety, politics, and culture. While his audacity can be breathtaking and his hypotheses grandiose, his approach is nevertheless stimulating. In this annotated edition, Fritz West provides the first English translation of this work by Anton Baumstark.