A minor matter was the printing in a separate section, called the Ordinary, of those parts of the Psalter that were to be recited frequently, perhaps several times in the same day, such as the invitatory, hymns for the seasons, blessings, absolutions, chapters, suffrages, the Lord's Prayer, Benedictus, Magnificat, Te Deum, etc.
[1] Much more radical was a completely new arrangement of the psalms, distributing them or, when too long, dividing them so as to have approximately the same number of verses in each day's office.
[1] This change, made with a view to restoring the original use of the liturgy, which provided for the chant or recitation of the entire Psalter each week, and the accompanying changes in the rubrics concerning the precedence between saints' days and the Sunday and ferial offices was meant to remedy the situation whereby the multiplication of saints' days had made celebration of Sundays and ferias, and consequently of certain psalms, very rare.
[1] Pope Pius X ordered that these changes, proposed by a committee of liturgists appointed by him, and adopted by the Congregation of Rites, be put into effect, at latest, on 1 January 1913.
In addition, by the motu proprio Abhinc duos annos of 23 October 1913, Pope Pius X added to his reform of 1 November 1911: no feast was to be fixed permanently to a Sunday except the Holy Name of Jesus and the Blessed Trinity (later, the feasts of the Holy Family and of Christ the King would be added).
[1] Through the apostolic constitution Divino afflatu, by which Pope Pius X promulgated his revision of the Roman Breviary, he abolished the Psalter established by his predecessor Pope Pius V and forbade its use, declaring that those who were obliged to recite the Divine Office every day failed to fulfill this grave duty unless they used the new arrangement.