The professor came near having a fit, and Barney Mulloy held onto his sides, convulsed with merriment.

"I beg your pardon, Mr. Clyde," said Frank. "I may have stretched the yarn a trifle."

"Just a trifle!" muttered the professor.

"If I had used giant-powder instead of dynamite in blowing up the track," said Clyde, "it is possible there might have been a smaller loss of life."

"But you did not blow up the track at all," hastily put in Frank. "You yanked the train off the rails with a lasso."

"So I did! I was thinking of another case. In this instance, if I had not stood so far from the railroad——"

"But you were on the pilot of the engine."

"Was I? So I was. Excuse me if I do not attempt any further explanations."

Then the three boys laughed heartily, and the professor was forced to join in at last.

Having restored Scotch to good nature, Frank requested Walter Clyde to tell his story. Clyde's face clouded a little, and he slowly said: