Movable Feasts and Fasts.--Those Feasts and Fasts which are not observed on a fixed date, but are variable being dependent on the time Easter is kept. Easter Day is always the first Sunday after the full moon which happens upon or next after the Twenty-first day of March; and if the full moon happen upon a Sunday, Easter Day is the Sunday after. The {192} _Movable Feasts_ are the following: Advent Sunday which is always the nearest Sunday to the Feast of St. Andrew (Nov. 30) whether before or after; the three remaining Sundays in Advent; Septuagesima, Sexagesima and Quinquagesima Sundays; the Six Sundays in Lent; Rogation Sunday; Ascension Day, Whitsun Day and Trinity Sunday; Monday and Tuesday in Easter Week; Monday and Tuesday in Whitsun Week; also the number of Sundays during the Epiphany and Trinity Seasons is variable, these Seasons being longer or shorter according to the time Easter is kept. The _Movable Fasts_ are the Forty Days of Lent, including Ash Wednesday, Good Friday, Easter Even and the Lenten Ember Days; the Rogation Days and the Whitsun Tide Ember Days. Music, Church.--(See HYMNS; GREGORIAN MUSIC, PLAIN SONG, and EVEN SONG, also INTONE.) Recognizing the fact that music always characterized the worship of God's Church both under the Old Dispensation and under the New, the essential thing is the character of the music in our churches to-day and the mode of rendering it. The organist, upon whom so much depends, should be a competent musician, with a good knowledge of the music of the church, and the music that he uses should be strictly sacred music. The choir should consist of the best voices and most cultivated singers available. They should be trained with care, not only in the music they are to sing, but also in the Church service. The late Bishop Thorold remarked on this subject, "We are all coming to feel that Church Music is a great help to worship. . . .But I also feel that if members of the choir accept {193} from God and the minister the privilege of taking part in the services, the one thing they owe to Almighty God, to the congregation and to themselves, is REVERENCE. I know choirs where their singing is almost a means of grace; it is done so beautifully, so reverently and with so much care that it lifts up the whole service to a higher level. The one secret of all good and acceptable rendering of the Church's music is _reverence_." Mystery.--A Truth or fact of Religion which has been revealed but not explained is called a mystery, because proposed to our faith faculty, such as the Incarnation, the Atonement, the Blessed Trinity, the Doctrine of the Eucharist. St. Paul speaks of the whole Revelation of Christ as the "Mystery of Godliness." Derived from the Greek word _musterion_, which in the Greek Church is the equivalent of our word "Sacrament."