With the Coronavirus pandemic there has been discussion on sites such as the New Liturgical Movement of the possibility of orationes imperatae being added to Masses. These are prayers, or a single prayer, added to Masses for a serious cause commanded by the Ordinary of the place. Without the command of the Ordinary, or general decree, it is not licit for any celebrant to add such prayers to the Mass.
However, what is possible, and without the need for any special permission is the addition of votive prayers to most Masses of simple rite including the majority of the ferial days of Lent and Passiontide. One of the areas of the application of the rubrics of the traditional liturgy that is not understood by many, or is indeed unknown, is the option for the celebrant of private Masses to add additional collects (and of course their corresponding secrets and post-communion orations) to those prescribed by the rubrics and Ordo.
R.G IX, 12 & 14 and Additiones VI, 6 are the foundation for this praxis. The votive collects can only be added in private, i.e. in this context private means said, not sung, Masses and non-Conventual Masses only on feasts of simple rite and ferial days which are not privileged (i.e. not on Ash Wednesday, or the Monday, Tuesday or Wednesday of Holy Week). The basic rules are the total number of orations must not exceed seven and that the total number must be uneven i.e. three, five or seven. Additionally, if (outside of Paschaltide) a prayer for the Dead is chosen it must occupy the penultimate place.
These prayers may come from the Sanctoral section of the missal, from the series of Votive Masses to be found after the Commons or from the Orationes Diversae at the back of the Missal. When these additional votive collects are added those from the Sanctoral are said before those from the Votive Masses (if two from the Sanctoral are chosen their relative order follows the precedence of the chosen saints in the Litany) and those from Votive Masses before those from the Orationes Diversae.
To take an example. On Friday of this week the second collect prescribed by the rubrics is A cunctis and the third collect is Omnipotens. So on Friday the celebrant may add either two additional votive collects or four but not one or three. If the Ordinary has prescribed orationes imperatae these are included in the total and cannot be omitted. Presuming there are no orationes imperatae our example might look like this:
Collect of the day with conclusion
Oremus [before the 2nd collect only]
2nd Collect A cunctis... [No conclusion]
3rd Collect Omnipotens... [No conclusion]
4th Collect St. George Deus, qui nos beati Georgii.. [No conclusion]
5th Collect Votive Mass for any Necessity Ineffabilem misericordiam tuam... [No conclusion]
6th Collect For the Dead Fidelium... [No conclusion]
7th Collect For the Health of the Living Praetende, Domine, fidelibus... Conclusion
On a practical note, particularly for those celebrants unused to many orations at Mass, noting the series to be used on a sheet of paper along with the use of ‘PostIt’ notes discretely inserted in the Missal will help achieve a natural flow without hiatus.