the "Song of the Three Holy Children" (Daniel 3:57-88 and 56), and the psalm of praise is Psalm 149. On Corpus Christi, the hymn O Salutaris Hostia is sung. In some seasons of the liturgical year, such as Lent or Eastertide, many of the prayers are proper for each day of the season. In Holy Week, the octaves of Christmas and Easter, and the last eight days of Advent, celebration of feast days is somewhat restricted. On some of these days, a memorial may be celebrated as a commemoration, adding an extra prayer at the end of the hour, while on others the memorial is completely removed from the calendar. Other rites of the Western Church In the Ambrosian Office, and also in the Mozarabic, Lauds retained a few of the principal elements of the Roman Lauds: the Benedictus, canticles from the Old Testament, and the laudate psalms, arranged, however, in a different order (cf. Germain Morin, op. cit. in bibliography). In the Benedictine Liturgy, the Office of Lauds resembles the Roman Lauds very closely, not only in its use of the canticles but also in its general construction. Armenian liturgy The Armenian Morning (or Early) Hour (Armenian: Առաւաւտեան Ժամ aṛawotean zham) corresponds to the office of Lauds in the Roman Liturgy, both in its position in the daily cycle and in its importance. This is the most complex of all Armenian liturgies in terms of the variations in the order and text of the liturgy depending on the day of the week, liturgical tone, commemoration of the day, and liturgical season. Many manuscripts and printed editions of the Armenian Book of Hours (Armenian: Ժամագիրք Zhamagirk`) state that the Morning Hour commemorates the Son of God, with some manuscripts adding, "at the time he was seized by the Jews." This is in reference to the story of the arrest and interrogation of Jesus found in the New Testament Gospels. Outline of the Morning Service In the Morning Hour for Sundays and Festal Days there are seven slots into which hymnody may be inserted which reflects the theme of the day. Each of these seven slots is associated with a Psalm or Canticle from the Old or New Testaments. Eastern Christianity Among the Eastern Orthodox and Eastern Catholic Churches which follow the Byzantine Rite, the office comparable to the Lauds of the Roman Rite is the Orthros. It also contains the