Flowers and relics of Saints are not to be placed on the altars during the Office and Masses of this time, except on the third Sunday ; and the same prohibition and exception exist in regard to the use of the organ.
The popular idea that the four weeks of Advent symbolize the four thousand years of darkness in which the world was enveloped before the coming of Christ finds no confirmation in the Liturgy.
On every day of Advent the Office and Mass of the Sunday or Feria must be said, or at least a Commemoration must be made of them, no matter what grade of feast occurs.
In the Divine Office the Te Deum , the joyful hymn of praise and thanksgiving, is omitted; in the Mass the Gloria in excelsis is not said. During this time the solemnization of matrimony ( Nuptial Mass and Benediction) cannot take place; which prohibition binds to the feast of Epiphany inclusively.
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Poaceae or Gramineae is a large and nearly ubiquitous family of monocotyledonous flowering plants known as grasses.
According to present  usage, Advent is a period beginning with the Sunday nearest to the feast of St.
Andrew the Apostle (30 November) and embracing four Sundays.
In them, the Church calls on the Divine Wisdom to teach us the way of prudence ; on the Key of David to free us from bondage; on the Rising Sun to illuminate us sitting in darkness and the shadow of death, etc.
In the Masses the intention of the Church is shown in the choice of the Epistles and Gospels.
Pope Innocent III (1198-1216) states that black was the colour to be used during Advent, but violet had already come into use for this season at the end of the thirteenth century.
Binterim says that there was also a law that pictures should be covered during Advent.
The lower part of each leaf encloses the stem, forming a leaf-sheath.