It is with the Breviary, however, that hymnology is especially concerned, as it is in it that the hymns of the Church are mostly to be found, while the sequences belong to the Missal. It contains the prayers said in the Church’s behalf every day at the canonical hours by the priests and the members of the religious orders. Originally there were only three of these canonical hours, and they were based on Old Testament usage. These were at the third, sixth, and ninth hour of the Scriptures (nine o’clock, noon, and three in the afternoon), and in the Western Church are called Tierce, Sext, and Nones, for that reason. The number afterward was increased to five and then to seven. To these three day hours were added three night hours, with two at the transition from night to day (Prime), and from day to night (Vespers). But to get up thrice in the night was too much for even monastic discipline, so they said two night services together at midnight, and then they slept till dawn. As this daily service differs in its contents according to the seasons of the Church year, and also is adapted to the commemoration of the saints of the Calendar, the Breviary is the most voluminous prayer-book known to Christendom. It generally is published in four substantial volumes, one each for the four natural seasons. It is used in such public services as are not accompanied by a celebration of any sacrament and in the choir service of the religious houses. In theory, however, the Church is present even at the solitary recitation of the hours by a secular priest; and when two say them in company they must say them aloud. Hymns were not in the services of the Breviary from the beginning. As late as the sixth century there was a controversy as to admitting anything but the words of Scripture to be sung. We find a Gallic synod sanctioning their use, and a Spanish synod taking common ground with our Psalm-singing Presbyterians. But in the next century even Spain, through the Council of Toledo (A.D. 633), appeals to early precedent in behalf of hymns, and decides that if people may use uninspired words in prayer, they may do the same in their praises—_Sicut ergo orationes, ita et hymnos in laudem Dei compositos nullus vestrum ulterius improbet_—which went to the core of the question and silenced the exclusive Psalm-singers. Twenty years later another Council of Toledo required of candidates for orders that they should know both the Psalter and the hymns by heart. Yet in the Roman Breviary no hymns were introduced before the thirteenth century, when Haymo, the General of the Franciscan Order, reformed it in 1244 with the sanction of Gregory IX. and Nicholas III.