We have limited ourselves to Initiation, Eucharist, Ordination, Office, and Calendar. Each of these subjects has been the responsibility of its own panel of authors, and they are presented historically under five main divisions: Jewish and New Testament, patristic, medieval, Reformation and counter-Reformation, and contemporary (i.e., the reforms of the last twenty years). The historical account of these rites is preceded by a general introduction, in the form of a series of notes giving background information on subjects, like Hippolytus or Cranmer, which recur in the study of all the rites. But we do not wish to present liturgy in isolation. We are anxious to make clear its theological foundations and connections; the theological introduction is an essential part of our intention. We are also anxious to show that the study of liturgy, even in its historical aspects, is not irrelevant to the present concerns of Christians, pastoral as well as liturgical; and so the concluding pastoral orientation is for us as important as the theological introduction. It was also our ambition, in each phase of historical exposition, to show the connection between liturgy and other aspects of Christian activity and interest. - Preface.