(1) Prime and Compline on certain days;
(2) Lauds, Prime, Terce, Sext, None, Vespers and Compline of certain feasts.
The preces feriales at Lauds and Vespers are the same in structure. They have the same structure in Terce, Sext, None, but differ in character. The preces dominicales at Prime and Compline have a form of their own, additions being made in the preces of Prime when said on a feria.
1. The Preces Feriales are said at Lauds on Ferias of Lent, Advent and Passiontide, Ember days, except Ember day at Pentecost and on Vigils (except on Vigil of Christmas, Epiphany, Ascension, Friday after Ascension and Vigil of Pentecost)—when the Office on those days is of the current feria.
2. At Prime (i) Preces Dominicales are said in all semi-doubles, simples, Ferial Offices.
(i) They are said at Little Hours if said at Lauds.
(ii) At Prime, Preces Feriales are said if they have been said at Lauds.
3. At Vespers Preces Feriales are said (1) on ferias of Advent and Lent when office is of feria.
4. At Compline, Preces Dominicales are said on all (i) semi-doubles, (ii) simples, (iii) all Ferias, unless at Vespers a double or an octave was celebrated.