The buildings we see there on the odd-number side opposite the Palais de Justice: the Tribunal du Commerce, the Préfecture de Police, the Firemen’s barracks, are all of nineteenth-century erection. So we come to the boulevard St-Michel, the far-famed “Boule-Miche” of the Latin Quarter, forming the boundary-line between arrondissements V and VI. As a boulevard it is not of ancient date. It began at its northernly end in 1855 as boulevard Sébastopol, Rive Gauche. Soon it was prolonged and renamed to memorize the ancient chapel erewhile in one of the streets it had swept away. Place St-Michel from which it starts has to-day a modern aspect. Almost all traces of the ancient Place du Pont St-Michel, as it was in bygone days, have vanished. The huge fountain we see and cannot admire, though perhaps we ought to, replaces the fountain of 1684. The arched entrance to the narrow street Rue de l’Hirondelle, once Irondelle, as an old inscription tells us, which began in 1179 as Rue de l’Arondale-en-Laas, and the glimpse at a little distance of the entrance to ancient streets on the boulevard St-Germain side, give the only old-world touch to the _place_. The high blackened walls we see in this Rue de l’Hirondelle are the remains of the ancient collège d’Autun founded in 1341. At No. 20, on the site of the ancient _hôtel_ of the bishops of Chartres, is an eighteenth-century _hôtel_. No. 38 of the boulevard is on the site of the house belonging to the Cordeliers, whose monastery was near by, where the royal library was kept from the days of Louis XIII to 1666. The Lycée St-Louis, founded in 1280 as the college d’Harcourt, covers the site of several ancient structures. A fragment--the only one known--of the boundary wall of Henri II, is within the college grounds, and beneath them the remains of a Roman theatre were found in 1861, and more remains in 1908. Where the boulevard meets Rue Monsieur-le-Prince, the city wall and a gate of Philippe-Auguste passed in olden days. And that was the site of the ancient _place_. No. 60, the École des Mines founded in 1783, and housed at the Mint, at that time an _hôtel_ Rue de l’Université, then transferred to Montiers in Savoie, finally settled here in 1815 in the hôtel Vendôme built in 1707 for the Chartreux, let in 1714 to the duchesse de Vendôme, who died there soon afterwards. This fine old structure still forms the central part of the Mining School. At No. 62 we see the Geological Map offices. In the court of No. 64 we find a house built by the Chartreux, inhabited in past days by the marquis de Ségur, and in later times by Leconte de Lisle. The railway station Gare de Sceaux at No. 66 covers the site of the once well-known Café Rouge. In the old Rue Royer-Collard opening at No. 71, in the sixteenth century Rue St-Dominique d’Enfer, we see several quaint old houses. Roman pots were found some years ago beneath the pavement of the _impasse_. The house at No. 91 is on ground once within the cemetery St-Jacques. César