The high altar as originally arranged had brass bars at the sides from which hung draperies. Behind it was another altar, that of the Holy Trinity, or les ardents raised so that it could be seen above the first one. Steps led up to this, and between them was a depository called the conditoire, where all the sacred vessels used at mass were kept. There was no tabernacle; as in most churches in the old times, the host was enclosed in a ciborium which hung in front of the altar. A figure in alabaster of the Virgin surmounted the autel des ardents. Above all were three rows of châsses, one above the other, as it were upon shelves, containing relics of S. Gendulphe, S. Séverin, S. Germain, bishop of Paris, S. Justin, S. Lucain, S. Ursula's young friends, and other martyrs. The reliquary of S. Marcel was behind the high altar, resplendent in gold and pearls and precious stones, an elaborate and beautiful work of art, by, said tradition, S. Éloi, the bishop of Noyon; but unfortunately, it was too valuable to escape the melting-pot, and its 436 marcs worth of gold found their way into coin of the Republic.

The church was rich in glass up to the year 1741, when a demon in human shape, one Levieil, the author of a treatise upon the art of glass-painting, set to work to re-adorn Notre-Dame. He describes the matter himself; what he found and what he transformed. In the choir and the apse the windows were ornamented with colossal figures 18 ft. high, representing bishops, vested and bearing pastoral staves, without the usual crook termination. A border of lozenge-shapen coloured glass framed the figures and filled up the divisions of the compartments. These windows Levieil dated no later than 1182, and he adds that there were many fragments of much older glass, probably emanating from the ancient basilicas, which preceded the present church, interspersed between the grisaille of the 12th century. In the tribune of the choir were windows given by a little personage whose effigy knelt at the bottom of one, Michel de Darency by name, chaplain of Saint-Ferréol, who died in 1358. The abbot Suger also gave some of the glass in the tribune, resembling that of his own church, S. Denis, which is so rich in resplendent sapphire blue. In some of the chapels were subjects such as the Beheading of S. John Baptist, a king and queen, possibly Philippe le Bel and Jeanne de Navarre, kneeling. All this, or most of it, was improved away, or re-arranged into floriated borders and armorial bearings upon white glass. A little remains of the 14th century: some small Angels holding the instruments of the Passion, a Pelican and its chicks, a Christ draped in red, and a little figure of the Virgin. This is all in the chevet. But the glory of the church is the glass of the rose-windows, which continue the subjects portrayed upon the sculpture of the doors over which they are placed. In the western rose the Virgin is in the central compartment, crowned and bearing a sceptre; on her left arm is the infant Christ giving the benediction. The twelve prophets surround her, and we see again the Signs of the Zodiac, and the work special to each month during the year. Virtues and Vices, Judges, Priests, Prophets, and Kings of Judah; Saints and Martyrs with the instruments of their martyrdom, or palms, decorate these exquisite windows, masterpieces of the art; equal to the windows of Metz and Strasburg, and contemporary with the stone walls which surround them.

Formerly the pavement was a mass of tombstones, erect or prostrate, bearing portraits of the defunct in brass or marble; but Louis XIV.'s architects thought well to improve many of them away, and substitute a marble pavement costing 300,000 francs. Many brass tombs had been melted up with the lectern some years previously. Among the celebrities who had formerly either effigies or epitaphs in the choir were the following. Princes and Princesses: Philippe, Archdeacon of Paris, son of Louis VI., 1161; Geoffroy, duc de Bretagne, son of Henry II. of England, 1186; Isabelle de Hainault, first wife of Philippe-Auguste, 1189; Louis, dauphin, son of Charles VI., 1415; Louise de Savoie, mother of François Ier., 1531 (only her heart was buried here); Louis XIII., 1643. Bishops of Paris: Eudes de Sully, 1208; Étienne II., called Tempier, 1279; Cardinal Aymeric de Magnac, 1384; Pierre d'Orgemont, 1409; Denis Dumoulin, patriarch of Antioch, 1447. Archbishops of Paris: Pierre de Marca, 1662; Hardouin de Péréfixe, 1671; François de Harlay, 1695; and an archbishop of Sens, who was also High Almoner of France, Renaud de Beaune, who died in 1616.

The few statues which are now in the church are modern: the marble monument by Pigalle, of the Comte d'Harcourt; of Cardinal de Belloy giving alms to a woman and child, by Deseine; and those of the three murdered archbishops, Sibour, Affre, and Darboy, who are buried in the crypt. The epitaph of Monseigneur Affre is as follows: Le bon pasteur donne sa vie pour ses brebis.... Que mon sang soit le dernier versé.

The bells of Notre-Dame were justly celebrated; but of the thirteen which were formerly in the towers, only one remains, the great bourdon, heard all over the city on great occasions; as, for instance, on Holy Saturday, when at High Mass, during the Gloria, it peals forth, giving the signal for all the other church bells to break their forty-eight hours' silence. It was given by Jean de Montaigu[117] in 1400, who named it Jacqueline, after his wife Jacqueline de La Grange; and in 1686 it was refoundered and re-baptised—Emmanuel-Louise-Thérèse, in honour of Louis XIV. and Marie-Thérèse of Austria.

The exterior decoration of Notre-Dame is very rich. Gargoyles, monsters of the most grotesque type, called also tarasques and magots, are there, encircling the towers, and disputing their importance with the Angel of the Judgment. The monsters stand, as they did centuries ago, gazing down upon Paris and its doings for good or for evil. Think of the events they have witnessed from the burning of fifty-four Templars in a slow fire by Philippe IV., to the horrors of the Commune. They must have seen the flaming villages and châteaux during the Jacquerie, and witnessed those useless sorties during the last war, when the Parisians vainly endeavoured to escape from the city and gain one of the outside army corps. They seem to look down in scorn upon humanity, whether in the form of the coronation of Henry VI. of England, so mean an affair that "un bourgeois qui marierait ses enfants ferait mieux les choses," or the misery of the famine of 1419-21. "Vous auriez entendu dans tout Paris des lamentations pitoyables, des petits enfants qui criaient, 'Je meurs de faim.' On voyait sur un fumier 20-30 enfants garçons, filles, qui rendaient l'âme de faim et de froid. On enterrait 100,000 personnes. Des bandes de loups courraient les campagnes et entraient même la nuit dans Paris pour enlever les cadavres." And all the ages through, the brutes have had the same expression of scorn, of spite, of diabolical ugliness, that one feels it to be a comfort that they are fixed safely to the gallery of the towers, out of the way of working mischief.

Amongst the great ceremonies which have taken place in the cathedral are: The marriage of Marie Stuart with François II., of France, in 1552; the marriage of Henri of Navarre and Marguerite de Valois upon a platform erected outside the great porch, to prevent Protestant contamination of the church. This was upon the eve of S. Bartholomew, the 18th August, just six days before the great work of massacre on the 24th. The coronation of Napoléon by Pope Pius VII., in 1804; the marriage of the Duc du Berry, and the baptism of the Duc du Bordeaux (Comte de Chambord) in 1816; the funeral of the Duc d'Orléans, son of Louis Philippe, in 1853; the marriage of Louis-Napoléon in 1853; the baptism of his son in 1857, and a certain number of episcopal consecrations.