CHAPTER 9 How Many Psalms Are to Be Said at the Night Office Feb. 11—June 12—Oct. 12 In winter time as defined above, there is first this verse to be said three times: “O Lord, open my lips, and my mouth shall declare Your praise.” To it is added Psalm 3 and the “Glory be to the Father,” and after that Psalm 94 to be chanted with an antiphon or even chanted simply. Let the Ambrosian hymn follow next, and then six Psalms with antiphons. When these are finished and the verse said, let the Abbot give a blessing; then, all being seated on the benches, let three lessons be read from the book on the lectern by the brethren in their turns, and after each lesson let a responsory be chanted. Two of the responsories are to be said without a “Glory be to the Father”; but after the third lesson let the chanter say the “Glory be to the Father,” and as soon as he begins it let all rise from their seats out of honor and reverence to the Holy Trinity. The books to be read at the Night Office shall be those of divine authorship, of both the Old and the New Testament, and also the explanations of them which have been made by well known and orthodox Catholic Fathers. After these three lessons with their responsories let the remaining six Psalms follow, to be chanted with “Alleluia.” After these shall follow the lesson from the Apostle, to be recited by heart, the verse and the petition of the litany, that is “Lord, have mercy on us.” And so let the Night Office come to an end. CHAPTER 10 How the Night Office Is to Be Said in Summer Time Feb. 12—June 13—Oct. 13 From Easter until the Calends of November let the same number of Psalms be kept as prescribed above; but no lessons are to be read from the book, on account of the shortness of the nights. Instead of those three lessons let one lesson from the Old Testament be said by heart and followed by a short responsory. But all the rest should be done as has been said, that is to say that never fewer than twelve Psalms should be said at the Night Office, not counting Psalm 3 and Psalm 94. CHAPTER 11 How the Night Office Is to Be Said on Sundays Feb. 13—June 14—Oct. 14 On Sunday the hour of rising for the Night Office should be earlier. In that Office let the measure already prescribed be kept, namely the singing of six Psalms and a verse. Then let all be seated on the benches in their proper order while the lessons and their responsories are read from the book, as we said above. These shall be four in number, with the chanter saying the “Glory be to the Father” in the fourth responsory only, and all rising reverently as soon as he begins it. After these lessons let six more Psalms with antiphons follow in order, as before, and a verse; and then let four more lessons be read with their responsories in the same way as the former.