"Perhaps he may still be on the train. I have a great mind to go and see."

"I don't think it would do any good. We could not prove that he took my purse."

"If you will excuse me for five minutes I will make a search."

Mark went through the next car and entered the second one, which was a smoking car. He looked about him, and in a seat about the middle of the car he saw the man of whom he was in search. He recognized him by his white tie and his red nose. He was smoking a cigar and gazing out of the car window.

The seat beside him being vacant Mark went forward and sat down in it.

The gentleman with the white tie glanced at him carelessly, but did not appear to think Mark was worthy of attention. He changed his mind when Mark said in a low voice:

"Please give me the purse which you took from a young lady in the second car back."


CHAPTER XVI.

MARK AS A DETECTIVE.