"Oh!" gasped the Kingsbridge girls.

"Wha-a-at are they fighting about?" gasped Mollie, her face pale with excitement, perhaps mingled with a little fear.

"They aren't fighting." Ruth had to place her lips close to the ears of her companion to make herself heard. "They are buying and selling. That is the way business is done on the floor of the Pit. See! There is father!"

The girls gazed wide-eyed. Mr. Stuart had projected himself into the maelstrom of excited traders. He, like the rest, was waving his arms and shouting. A group of excited men instantly surrounded him. He was for the moment the centre of attention, for Robert Stuart was one of the largest and most successful traders on the Chicago Board of Trade. The battle waged furiously about him, while the "Automobile Girls" gazed in fascinated awe upon the strange, exciting scene.

All at once a gong sounded. The tension seemed to snap. Men who had been fighting and shouting suddenly ceased their activities. The bodies of some grew limp, as it were. Some staggered. Others walked from the floor laughing and chatting. Out of the crowds strode a man—a young man. What first attracted the attention of the girls to him was a bandage about his head. He was walking straight toward them, though on the floor below. All at once he glanced up. Only Bab was looking down at him now. His gaze swept over the gallery. His eyes rested for a moment on the face of Barbara Thurston.

"The man from section thirteen!" exclaimed Bab under her breath. Then as she caught his eyes, she gazed in trembling fascination. The man's features were contorted. Barbara thought it was the most frightful face she ever had gazed upon. Anger, deadly passion and desperate purpose were written there so plainly that anyone could read. Looking her fairly in the face, the man sneered. Whether he recognized her or not, the girl did not know.

"Oh!" cried Bab, with a shudder.

"What is it, dear?" questioned Ruth anxiously.

"Oh, take me away from here. Please take me away," almost sobbed Barbara. "I—I can't stand it. It was awful."

"Come, girls," urged Ruth. "Bab is upset. I will confess that I have had enough of this place of nightmares." Rising, she led her friends down the stairs to the lower floor. Barbara was still trembling when they saw Mr. Stuart coming toward them. His face was set and stern. But the instant he caught sight of the "Automobile Girls" the sternness drifted slowly from his features, giving place to a pleased smile.