All kinds of famous houses existed on or in the immediate neighbourhood of the Place Maubert: that, for instance, of Grandjean, the celebrated surgeon and oculist to Louis XVI., and that of Marie Antoinette. Local tradition assigns one of the houses to Gabrielle d’Estrées--“la belle Gabrielle” of Henri IV., and here she may really have lived, though the hostile critics of the tradition point out that the architecture of the house does not take us further back than the reign of Louis XV. Part of the house in question is now let out in artisans’ lodgings. On the ground floor, painted red, is the Château Rouge, called also--it must be feared with more than external significance--the Guillotine. A special chapter is devoted to the Château Rouge by M. Macé, in his volume on the police of Paris. It is composed of two large rooms, which are filled from morning till night with the disreputable and dangerous classes; close by is a lodging-house, constructed in the garden of the ancient mansion, and let out entirely to Swiss workmen, who live together in the most economical manner, and pass the gaping mouth of the Château Rouge ten times a day without ever going in. It was at the tavern of the Château Rouge that, in 1887, three men proposed, accepted, and carried out among themselves a bet to throw a woman into the Seine simply for amusement. The victim was a drunken rag-picker, and the stake was two sous: the price of a small glass of brandy. [Illustration: PLACE MAUBERT, WITH THE STATUE OF ÉTIENNE DOLET.] In the immediate neighbourhood of the University and the Sorbonne, in the very heart of the district of the schools, are two of the most ancient and interesting buildings in Paris: the Palais des Thermes, which carries us back to the Lutetia of the Romans, and the Hôtel Cluny, which recalls mediæval Paris. The Palace of the Hot Baths is in ruins, but these ruins of a building which dates from the third century contain monuments more ancient than themselves. The Bath-house of the Romans was at the same time a citadel; it is said to have been built in the reign of the Emperor Constantine Chlorus, who inhabited Lutetia from 287 to 292. In the year 360 Julian the Apostate was proclaimed emperor in this palace by the army and the people, and the palace is still generally known as the Thermæ of Julian. This honour was due to him by reason of his special predilection for his “dear Lutetia.” After him, the Emperors Valentinian and Gratian passed at this palace the winter of 365.