“Take that, with the compliments of the lone star ranger!” he muttered. “Don’t know what it’s all about, but that’s my share.”

His blow infuriated the man, who drove at him with an angry roar, but the professor was scrambling to his feet, and the second man grasped his leader by the arm. He spoke to him in a low tone, and the two, with a slight hesitation, turned and fled up the alley. Convinced that pursuit would be useless, the young man turned to the professor.

“Are you hurt, sir?” he asked, quickly.

In the faint light the professor saw that he was a boy of twenty or thereabouts, tall and somewhat lanky, with red hair and a lean face, on which freckles had taken up a permanent home. The professor shook his head.

“No, thanks to you. Those fellows were going to throw me into the water. Were you in that car?”

“Yes,” grinned the boy. “That is my private chariot, called ‘Jumpiter,’ because of its habit of doing something very much like jumping! Have you been robbed?”

The professor felt through his pockets and nodded. “Yes, a few dollars and a letter has been taken from me. I don’t care much about the money, but the letter was from my son Ned, and I valued that somewhat. I would like to thank you sincerely for your timely arrival.”

“Don’t mention it,” begged the young man. “Let’s get out of here. I’ll drive you to wherever you want to go.”

When they entered the battered car the professor told the boy the name of the hotel at which he was staying and they rolled away. Then the teacher asked the name of his rescuer.

“Mackson is my name,” replied the boy. “Terry Mackson, from Beverley, Maine.”