At the conclusion of the octave of Corpus Christi comes the comparatively modern festival of the Sacred Heart of Jesus. As it is thus in point of time closely connected with Corpus Christi, so also it resembles it in many points. In the first place, it is essentially appointed for the glorification of the Incarnation and the Person of the Incarnate, and, secondly, its origin has many points in common with that of Corpus Christi. Its introduction is connected with the visions of the Blessed Margaret Mary Alacoque (1647-90), which she saw in the Convent of the Visitation at Paray-le-Monial, during the years 1673-75. The cultus of the Sacred Heart seems to have existed earlier as a form of private devotion. In support of it certain passages are appealed to in the writings of saints of earlier times, which contain its fundamental principles. Among others, St Gertrude, and the Carthusian James of Landsberg, are quoted. The Blessed Margaret Mary had much to suffer in her attempts to establish the cultus, but finally it was introduced for the first time in 1686 at Paray-le-Monial, or, according to others, in the Convent of the Visitation at Moulins in 1674. The public cultus was introduced by Charles François de Loménie, Bishop of Coutances, who, in consequence of Margaret Mary’s revelations, consecrated a chapel in honour of the Sacred Heart in his seminary in 1688, and erected a confraternity under the same title. He was followed by Peter de Grammont, Bishop of Besançon, who, in 1692, ordered a special Mass with the title _Cordis Jesu_, to be printed in the missal for his diocese, for the Friday after the octave of Corpus Christi. The Bishop of Langres adopted this Mass in his diocese, and finally the Archbishop of Lyons, Primate of Gaul, at the end of 1718 ordered the feast to be kept by the churches under his jurisdiction. The authoritative recognition of the feast was given by Clement XIII. in 1765.[287] B. CHRISTMAS AND THE CHRISTMAS SEASON 1. _Christmas_ Christmas, or the feast of our Lord’s birth (_Nativitas Domini_, τὰ γένεθλια, γέννησις Χριστοῦ), has this in common with Easter that it also is the centre of other festivals which group themselves around it, but it differs from Easter inasmuch as it is an immovable feast, and so falls on a fixed day of the month. The whole Church, and all the sects, agree in observing the 25th December as this date. As it has cost us already some trouble to show how the determination of Easter was arrived at, so the questions which arise in regard to the date of Christmas are by no means few. The answer to these questions entails a special and critical investigation into several points of history, which, though it may not prove interesting to everyone, will nevertheless be full of information to those who undertake to study it.