"Let me give him a question," grinned Bearover. "Let's see if he'll answer me."
"Oh, very well," said Frank. "Dick, do you see this gentleman here? Take a look at him. He's going to give you a problem, and you must answer it. I trust he'll make it a simple one. You haven't been brushing up in mathematics lately, and a difficult problem might bother you a little. Will you kindly make it a simple question, Mr. Bearover?"
"Oh, yes; oh, yes," chuckled the stout man, "I'll make it simple enough. Let's see if your wonderful horse can tell us how many ten and five added together be."
The horse stood quite still for a moment and did not lift its foot. Instead of that, the creature seemed to be eying Basil Bearover with a look of disdain. Finally a most astounding thing happened, for Dick's lip curled back, exposing his teeth, and from his mouth there seemed to issue these words:
"Any blamed fool would know that ten and five make fifteen!"
CHAPTER XXXI.
A CHALLENGE.
Basil Bearover's usually florid face turned pale, and the man actually staggered.