Christian Initiation. A Comparative Study of the Interpretation of the Baptismal Liturgy in the Mystagogical Writings of Cyril of Jerusalem, John Chrysostom, Theodore of Mopsuestia, and Ambrose of Milan. By Hugh M. Riely. The Catholic University of America Studies in Christian Antiquity, no. 17. Washington, D.C.: The Catholic University of America Press, Consortium Press, 1974. xxxiii+481 pp. $21.00.