The stoa or celebrated Portico at Athens, called the Pœcile on account of its paintings, was the pride of the Athenians. Polygnotus, Mycon, and Pantænus adorned it with pictures of gods, heroes, benefactors, and the most memorable acts of the Athenians, as the incidents of the siege and sacking of Troy, the battle of Theseus against the Amazons, the battle between the Athenians and Lacedæmonians at Œnoe in Argolis, the battle of Marathon, and other memorable actions. The most celebrated of these were a series of the Siege of Troy, and the Battle of Marathon by Polygnotus, more especially the latter, which eclipsed all the others, and gained the painter so much reputation that the Athenians offered him any sum he should ask, and when he refused all compensation, the Amphictyonic council decreed that wherever he might travel in Greece, he should be received with public honors, and provided for at the public expense. According to Pausanias, Polygnotus represented the hero Marathon, after whom the plain was named, in the act of receiving Minerva, the patroness of Athens, accompanied by Hercules, about to be joined by Theseus, whose shade is seen rising out of the earth--thus claiming Attica as his native soil. In the foreground, the Greeks and Persians are combating with equal valor, but in extending the view to the middle of the composition, the barbarians were seen routed and flying to the Phœnician ships, which were visible in the distance, and to the marshes, while the Greeks were in hot pursuit, slaying their foes in their flight. The principal commanders of both parties were distinguished, particularly Mardonius, the Persian general, the insertion of whose portrait gratified the Athenians little less than that of their own commander, Miltiades, along with whom were Callimachus, Echetlus, and the poet Æschylus, who was in the battle that day. It is evident that the painter did not strictly follow history, but treated his subject in a grand poetic and heroic style, and that too, we may rest assured, with consummate skill, to have elicited such applause from a people too refined to be deceived by any meretricious trickery of art. MOSAICS. Mosaics are ornamented works, made in ancient times, of cubes of variously colored stones, and in modern, more frequently of glass of different colors. The art originated in the East, and seems first to have been introduced among the Romans in the time of Sylla. It was an ornament in great request by the luxurious Romans, especially in the time of the Emperors, for the decoration of every species of edifice, and to this day they continue to discover, in the ruins of the Imperial Baths, and elsewhere, many magnificent specimens in the finest preservation. In Pompeii, mosaic floors and pavements may be said to have been universal among the wealthy.