We are on supremely interesting ground here, ground at once sacred, historic and characteristic of the mundane life of the city above which it stands. At or near its summit, St-Denis and his two companions were put to death in the early days of Christianity. On the hill-side most memorable happenings have been lived through. In the old streets and houses up and down its slopes poets and artists have ever dwelt, worked and played, and in its theatres, its music-halls, cabarets, etc., Parisians of all classes have sought amusement--good and evil. In past days Paris depended on Montmartre for its daily bread, for the flour that made it was ground by the innumerable windmills of the _Butte_. The sails of many of those windmills worked far into the reign of Napoléon III, who did not admire their aspect and even had a scheme for levelling the _Butte_! So it is said. Reaching the arrondissement by the Rue des Martyrs, which begins, as we know, in arrondissement IX, we come upon two buildings side by side of very opposite uses: the Comédie Mondaine, formerly the famous Brasserie des Martyrs and Divan Japonais, and the Asile Nationale de la Providence, an institution founded in 1804 as a retreat for aged and fallen gentlepeople. The _hôtel_ at No. 79 is on the site of the Château d’hiver, where the Revolutionists of Montmartre had their club. No. 88 was the dancing-saloon known as the Bossu. No. 76 that of the Marronniers. Rue Antoinette shows us points of interest of another nature. At No. 9, in the couvent des Dames Auxiliatrices du Purgatoire, we see the very spot on which there is reason to believe St. Denis and his companions suffered martyrdom. An ancient crypt is there, unearthed in the year 1611, to which we are led down rough steps, beneath a chapel built on the site in 1887; we see a rude altar and above it words in Latin to the effect that St-Denis had invoked the name of the Holy Trinity on that spot. The crypt is no doubt a vestige of the chapel built on the site by Ste-Geneviève. It was in this chapel, not as is sometimes asserted higher up the _Butte_, that Ignatius Loyola and his six companions, on August 15, 1574, made the solemn vow which resulted in the institution of the Order of the Jesuits. The chapel was under the jurisdiction of the “Dames de Montmartre,” and after the great fire at the abbey the nuns sought refuge in the old chapel here, made it a priory. Several persons of note were buried there. At the Revolution it was knocked to pieces and remained a ruin until rebuilt by the abbé Rebours in 1887.