IV class
Violet
Commemoration of St. Valentine, Priest and Martyr
Mass of preceding Sunday (Violet), no Gloria, commemoration added, omit tract, no Credo, common preface
OR
Mass of the commemorated feast, Gloria, gradual and tract, no Credo, common preface
Matins: Invitatorium and Hymn per annum as given in the psalter; lessons from occurring scripture, no Te Deum
Lauds: Antiphons and psalms of the feria (second schema); remainder per annum as given in the psalter; oration of the preceding Sunday; commemoration added; no preces
Hours: Antiphons and psalms of the feria; remainder per annum as given in the psalter; oration of the preceding Sunday
Vespers: Antiphons and psalms of the feria; remainder per annum as given in the psalter; oration of the preceding Sunday; no preces
Compline: Of the feria