"He'll probably know how to handle him," supplemented Tom.

"Yes, he would if he's a bull-fighter," scoffed Dick, "and I never
heard of there being any matadors in the vicinity of Nestorville."

"Lots of doormats, though," grinned Tom.

"Say, if you do that again I'll throw you out of the car," cried Jack
at this atrocious pun.

"Sorry, couldn't help it. Just slipped out," said Tom contritely.

"Well, you'll slip out if the offense is repeated," retorted Dick.
"But," he went on, "seriously, fellows, we've got to do something."

"Try blowing the horn," suggested Tom. "It has scared everything else
we met. Horses shy at it, so do other autos. Maybe it will get the
bull's goat."

"I'll try it, at all events," said Jack.

He pressed the button and the unearthly screech of the electric auto's
siren split the air. But the bull merely cast an inquiring glance in
their direction and then resumed his vigil over the professor.

"Boys," wailed the unhappy geologist, "can't you do something,
anything? I can't roost in this tree all night, like a bird."

The boys couldn't help grinning at this. With his sharp nose, big