Three things should be noted about the Sainte Chapelle. (1) It is a chapel, not a church; therefore it consists (practically) of a choir alone, without nave or transepts. (2) It is the domestic Chapel of the Royal Palace. (3) It is, above all things, the Shrine of the Crown of Thorns. These three points must be constantly borne in mind in examining the building. Erected later than Notre-Dame, it represents the pointed style of the middle of the thirteenth century, and is singularly pure and uniform throughout. Secularized at the Revolution, it fell somewhat into decay; but was judiciously restored by Viollet-le-Duc and others. The "Messe Rouge," or "Messe du St. Esprit," is still celebrated here once yearly, on the re-opening of the courts after the autumn vacation, but no other religious services take place in the building. The Crown of Thorns and the piece of the True Cross are now preserved in the Treasury at Notre Dame. Examine the exterior in detail from the court on the south side. More even than most Gothic buildings, the Sainte Chapelle is supported entirely by its massive piers, the wall being merely used for enclosure, and consisting for the most part of lofty windows. As in most French Gothic buildings, the choir terminates in a round apse, whereas English cathedrals have usually a square end. The beautiful light flêche or spire in the center has been restored. Observe the graceful leaden angel, holding a cross, on the summit of the chevet or round apse. To see the facade, stand well back opposite it, where you can observe that the chapel is built in four main stories--those, namely, of the Lower Church or crypt, of the Upper Church, of the great rose window (with later flamboyant tracery), and of the gable-end, partially masked by an open parapet studded with the royal fleurs-de-lis of France. The Crown of Thorns surrounds the two pinnacles which flank the fourth story. The chapel consists of a lower and an upper church. The Lower Church is a mere crypt, which was employed for the servants of the royal family. Its portal has in its tympanum (or triangular space in the summit of the arch) the Coronation of the Virgin, and on its center pillar a good figure of the Madonna and Child. Enter the Lower Church. It is low, and has pillars supporting the floor above. In the polychromatic decoration of the walls and pillars, notice the frequent repetition of the royal lilies of France, combined with the three castles of Castille, in honor of Blanche of Castille, the Mother of St. Louis.