4. A little more to the left, is the site of _the Vulcanal_, so called from an altar dedicated to Vulcan, a platform (still defined) where, in the earliest times, Romulus and Tatius used to meet on intermediate ground and transact affairs common to both; and where Brutus was seated, when, without any change of countenance, he saw his two sons beaten and beheaded. Adjoining the Vulcanal was the _Græcostasis_, where foreign ambassadors waited before they were admitted to an audience of the senate. 5. Below the Vulcanal, and just behind the Arch of Severus, is the site of the _Temple of Concord_, dedicated, with blasphemous inappropriateness, B.C. 121, by the consul Opimius, immediately after the murder of Caius Gracchus. Here Cicero pronounced his orations against Catiline before the senate. A pavement of coloured marbles remains. At its base are still to be seen some small remains of the _Colonna Mænia_, which was surmounted by the statue of C. Mænius, who decorated the rostra with the iron beaks of vessels taken in war. 6. The three beautiful columns which are still standing were attributed to a temple of Jupiter Tonans, but are now decided to belong to the _Temple of Vespasian_. The engravings of Piranesi represent them as buried almost to their capitals, and they remained in this state until they were disinterred during the first French occupation. The space was so limited in this part of Rome, that in order to prevent encroaching upon the street Clivus Capitolinus, which descends the hill between this temple and that of Saturn, the temple of Vespasian was raised on a kind of terrace, and the staircase which led to it was thrust in between the columns. This temple was restored by Septimius Severus, and to this the letters on the entablature refer, being part of the word _Restituere_. Instruments of sacrifice are sculptured on the frieze. 7. On the left of the excavated space, close beneath the Tabularium, a low range of columns recently re-erected represents the building called the _School of Xanthus_, chambers, for the use of the scribes and persons in the service of the curule ædiles, which derived their name from Xanthus, a freedman, by whom they were rebuilt.