An important work, of great interest both to liturgical scholars and to less specialist readers; it contributes to a deeper understanding of Norman monastic history. JOURNAL OF ECCLESIASTICAL HISTORY [Marjorie Chibnall] One of the most important publications of its kind to have appeared in recent years, [it] assumes a central place in the study of monastic liturgical practice in the Middle Ages.... The result is a sort of super-ordinal hardly, if ever, matched in one medieval manuscript alone. And it is all managed with perfect clarity.... This edition shows that the study of medieval liturgical books is in safe and expert hands. Without doubt [the author] deserves our most sincere congratulations.