The horses in the quadriga with which Marcus, the son of Mary, made his appearance in the arena had never before been driven in the Hippodrome. Demetrius, the owner's brother, had bred and trained them--four magnificent black Arabs--and they excited much interest among the knowing judges who were wont to collect and lounge about the 'oppidum', as it was called, behind the 'carceres'--[The covered sheds or stalls in which the horses were brought to wait for the start.]--to inspect the racers, predict the winner, offer counsel to the drivers, and make bets. These perfect creatures were perhaps as fine as the famous team of golden bays belonging to Iphicrates, which so often had proved victorious; but the agitatores, or drivers, attracted even more interest than the horses. Marcus, though he knew how to handle the reins--he had already been seen in experimental races--could hardly hold his own against Hippias, the handsome young heathen, who, like most of the drivers in the arena, was an agitator by profession. A story was told of his having driven over a bridge which was not quite as wide as the outside edges of his chariot- wheels; and there were many witnesses to the feat he had performed of writing his mistress' name with his chariot-tracks in the sand of the Hippodrome. The betting was freest and the wagers highest on Hippias and the team belonging to Iphicrates. Some few backed Marcus and his Arabs, but for smaller sums; and when they compared the tall but narrow-shouldered figure of the young Christian with the heroic breadth of Hippias' frame, and his delicate features, dreamy blue eyes and downy black moustache with the powerful Hermes-head of his rival, they were anxious about their money. If his brother now, the farmer Demetrius--who was standing by the horses' heads--or some well-known agitator had held the reins, it would have been a pleasure and a profit to back such horses. Marcus had been abroad, too, and men shrugged their shoulders over that, for it was not till the last few days that he had been seen exercising his horses in the Hippodrome. Time was going on, and the Imperial envoy, who had been elected to preside as judge, at length took his place; Demetrius whispered a few last words of advice to his brother and went back into the arena. He had secured a good place on the stone podium and on the shady side, though there were several seats vacant among those belonging to his family; but he did not care to occupy one of these, preferring to keep out of the way of his step-mother, who had made her appearance with a senator and his wife to whom she was related. He had not seen her for two days; his promise to Karnis that he would try to find Dada, had kept him fully occupied, and he had done his best in all earnest to discover the girl.