_Question_: "An in benedicendo populum cum sanctissimo Sacramento sit servandus modus infrascriptus: Cum sacerdos stat ante populum, ostensorium ante pectus tenet, tum elevat illud decenti mora non supra caput, sed tantum usque ad oculos, et eodem modo illud demittit infra pectus, mox iterum recte illud attollit usque ad pectus, et deinde ad sinistrum humerum ducit, et reducit ad dexterum, et rursus ante pectus reducit, ibique aliquantulum sistit quasi peracta ad omnes mundi partes cruce, eam etiam venerandam omnibus praebet: tunc gyrum perficiens, collocat ostensorium super altare?" _Answer_: "Si placet, potest observare supradictum modum.... Sin minus, servandus est modus dispositus in _Caer. Ep._, l. ii., c. xxxiii., ubi requiritur tantummodo ut cum eodem SS. Sacramento celebrans producat signum crucis super populum". It is now easy to fix the ceremonies to be observed in cases where the deacon presents the ostensorium to the priest, and receives it from him after the benediction. First, the celebrant kneels in receiving the Blessed Sacrament from the deacon, and the deacon, when he receives it from the celebrant. This is a standing liturgical rule--the rubric of the Missal for Holy Thursday says: "Finita Missa ... fit processio.... Celebrans indutus pluviali albo ... in medio genuflexus ... accepto calice cum Sacramento de manu diaconi stantis.... Cum autem ventum fuerit ad locum paratum diaconus genuflexus a sacerdote stante accipit calicem cum Sacramento". In the _Cer. Ep._ (l. ii., c. xxiii., n. 12 et 13): "Diaconus assistens ... capit SS. Sacramentum de altari, et illud, stans, offert episcopo genuflexo. Cum pervenerit ad sacellum ubi Sacramentum deponi debet ... cum erit episcopus ante supremum gradum altaris, diaconus accipiet de manu ipsius stantis SS. Sacramentum genuflexus". In the rubric for the procession of Corpus Christi (ibid., c. xxxiii., nos. 20 et 24): "Diaconus assistens a dexteris accedet ad altare, et cum debitis reverentiis accipiet tabernaculum sive ostensorium cum SS. Sacramento de altari, et illud in manibus Episcopi genuflexi collocabit.... Postquam Episcopus pervenerit ad supremum altaris gradum, diaconus a dextris cum debita reverentia et genuflexione ... accipiet de manu ipsius Episcopi stantis SS. Sacramentum".