Communion; all other services are but adjuncts to the one service appointed by our Lord Himself. In the Primitive Church an ordinary Christian would not have considered that he had kept the Lord's Day as a day of worship if he had not attended a celebration of the Holy Communion. When, therefore, our people grasp these Scriptural ideas, then no longer can it be said that worship is a "Lost Art" among the American people. (See HOLY COMMUNION; also RESPONSIVE SERVICE.) X X.--The letter X resembles the shape of the Cross of St. Andrew, which has come into quite prominent notice as being the badge of the BROTHERHOOD OF ST. ANDREW (which see). X P.--These letters belong under this head only in appearance as they are in reality the first two letters of the Greek word _Christos_, meaning "Christ." The X is the Greek letter _Chi_ and is equivalent to the English letters "ch"; the P is called _Rho_ and is the same as the letter "r;" they thus represent the first three letters of the word _Christ_. These two Greek letters are used in Church decorations either separately or as a monogram, as a symbol or emblem of our Lord. {282} Y Y Cross.--By reason of its shape, the Cross embroidered on the CHASUBLE (which see) is called the Y Cross, and is intended to represent the outstretched arms of our Blessed Lord on the Cross, and symbolizes the Sacrifice which He there offered for the sins of the whole world, of which the Holy Eucharist is the perpetual Memorial. Year.--(See CHRISTIAN YEAR.) Yule.--The old English name for CHRISTMAS (which see). A word of doubtful origin. Yule Tide.--The season or time of Christmas. Z Zealot.--One of a fanatical Jewish sect, which prevailed in the time of our Lord. In the New Testament, this name is given to one of our Lord's Apostles, namely, ST. SIMON (which see). Zuchetto.--The name give to a skull cap worn by the clergy instead of the biretta; when worn by a Priest the color is black, but that worn by a Bishop is purple. {283} INDEX.