To commemorate the 75th anniversary of Mystici Corporis Christi, this issue of Landas features excerpts from the two-volume doctoral dissertation of R.P. Catalino G. Arévalo, S.J. on the Ecclesiology of Giovanni Perrone, Carlo Passaglia, and Clemens Schrader (Rome: Pontifical Gregorian University, 1959). These excerpts focus in particular on Some Aspects of the Theology of the Mystical Body of Christ in the ecclesiology of these theologians of the Roman College in the mid-19th century. – from the Editor’s Preface