The mausoleum stands a few yards from the arch. The main part is square, the lower portion forming a pedestal set upon a base, which measures about 22 feet each way, and the upper portion being an open story with four Corinthian engaged columns at the angles. The whole is crowned with a circular top composed of ten Corinthian pillars, the entablature of which supports a cupola originally covered with palm leaf scales. The height of the monument is about 60 feet. The podium is ornamented with fine bas-reliefs, which Mérimée describes as representing--(South) a hunt; (East) a Battle of Amazons; (West) the death of Patrocles; (North) a Cavalry engagement. The figures of the upper storys are also richly carved. Under the dome stand two draped statues. The following inscription is engraved on the architrave of the north side: SEX. L.M. IVLIEI. C.F. PARENTIBUS. SVEIS. Sextus, Lucius, Marcus, Julii, Curaverunt fieri parentibus suis--(Sextus, Lucius, Marcus, of the Julii, have caused this monument to be constructed to the memory of their relatives). Various dates are assigned by different authors to these monuments; but probably Mérimée is right in considering the arch at least of about the same date as that of Orange. This mausoleum and similar monuments, as will be hereafter noticed, have evidently had a considerable influence on the forms of the early Mediæval church steeples of Provence. ARLES.--We have now arrived at the capital of Roman Gaul--the famous city of Arelate or Arles. It is supposed to have been founded by the Greeks from Massilia as a trading centre, and had become an important town before the time of Cæsar. The situation occupied was a very advantageous one, being at the point of the Delta of the Rhone, where the bifurcation of the river commences. The town is also supposed to have been in communication with an interior navigable Lagoon in the time of the Romans, so that commodities could be conveyed by water with great facility in all directions. Arles thus formed a valuable mercantile centre. The population is believed to have reached 100,000. Here Cæsar had the galleys constructed which he required for the siege of Massilia. After taking that town he sent Tiberius to establish a colony at Arles. With Constantine Arles was a favourite city, and he made it the capital of Gaul. The town was at that time divided by the river into two sections, a part being on each side. These Constantine united by a bridge of boats. An abundant water supply was brought by aqueducts from the mountains, and conducted across the river by means of syphon pipes of lead, several of which have been found with the name of the maker stamped upon them, and are now to be seen in the Museum.