In brief
Everything is done as at a Low Mass, except that the priest sings all that is sung in the Solemn Mass, and that he may sit down at the Gloria and Credo.
In detail
Six candles are lighted instead of two.
If the Asperges is done, the following rubrics apply:
The celebrant puts on cowl, amice, alb, cincture, maniple and stole. Unlike the secular priest, he does not wear the cope, unless there is to be a Procession before the Mass (in which case, he lays aside the maniple).
When it is time for the Asperges, the celebrant with hands joined and having his head covered with cowl and amice, makes a sign to the other ministers that it is time to begin; then he makes a moderate how to the cross. He then follows his ministers to the altar, where he takes his place between them. All genuflect or make a profound bow together.
Standing erect, he uncovers his head, receives the sprinkler, and sings the two words: Asperges me (during Paschal time, Vidi aquam). If he needs the card for this, the minister gives it to him. Then the celebrant lightly sprinkles the altar first and then the ministers. He now makes a profound how (he does not genuflect. even if the Blessed Sacrament is reserved at this altar). Accompanied only by the acolyte carrying the stoup, he approaches the congregation. It is customary for the celebrant to go down the middle aisle, sprinkling first the people on the Epistle side of the church and, on his return, the people on the Gospel side.
Returning to the foot of the altar, he makes a profound bow (even if the Blessed Sacrament is reserved at the altar), gives the sprinkler to the minister, and remains there until the choir has finished singing the antiphon. He then sings the versicles and prayer, a minister holding the card for him, When he is finished, he covers his head, joins his hands before his breast and makes a profound bow or a genuflection. He follows his ministers to the sacristy where he completes his vesting for Mass.
The priest carries the chalice from the sacristy and places it on the altar as at Low Mass, unfolding the corporal, but he does not then take the wine and water. Instead, he places the covered chalice on the altar, opens the missal, and says Actiones nostras, etc.. Then he descends to the foot of the altar where he beings with the usual prayers. He does not sit for the Kyrie but remains at the missal.
If the music for the Gloria is long, the priest may go to the sedilla, in which case the gremial is spread over his lap by the acolytes and removed when he is about to return to the altar.
At the Orationes, if the priest sings Flectamus genua, he himself makes the response: Levate.
The Epistle is sung by an acolyte. [After 1961, it was no longer necessary for the priest to read the Epistle in a low voice simultaneously.] If the acolyte is unable to do this, he may recite it recto tono, or the priest may do so at the altar.
After the Gradual (Responsory) or Tract, the priest uncovers the chalice and takes the wine and water in the usual way. When he covers the chalice with its veil, the thurifer, having ascended the altar steps presents a spoonful of incense, saying: Benedicite. The priest makes the sign of the cross over it, saying: In nomine Patris, etc.
The priest now makes a moderate inclination at the middle of the altar with his hands joined and says: Dominus sit in corde meo, etc., after which, he goes to the Gospel corner to sing the Gospel.
Having sung: Dominus vobiscum and Sequentia sancti Evangelii, etc., the priest takes the censer and three times incenses the missal, Returning the censer to the thurifer, he proceeds to sing the Gospel. The Gospel ended, he kisses the book in the usual way.
The priest intones the Credo at the middle of the altar, and finishes the recitation of it at the Gospel side. When the choir sings: Et incarnatus est, he kneels at the middle of the altar. If the music is brief, he remains at the middle until the singing is finished; if not, he goes to the sedilia. When the priest has concluded the Suscipe sancta Trinitas, etc. (at the Offertory), the thurifer presents a spoonful of incense to be blessed. The priest blesses it in the usual way. When the censer is ready, the priest takes it and incenses the oblations (host and chalice) and the altar, as is done in Solemn Mass. At the Epistle corner, he returns the censer to the thurifer who incenses him. The priest remains in the same place to wash his fingers. The rest is done as usual.
Since there is no deacon, the pax is not given. (Neither is it given at Low Mass.)
After the last Gospel, the priest folds the corporal and covers the chalice in the normal way. Raising his amice, he takes the chalice, descends the steps, bows or genuflects, and leaves the altar. There are no prayers recited after this Mass.
