The pursuers dashed up with drawn revolvers, ready to shoot at the least sign of resistance.

Bluff leaped from his pony and struck a match.

Tad's mount lay dying in the brush.

"There's no one here," said Bluff, his face working nervously.

Of Tad Butler there was no sign. He had disappeared utterly.

CHAPTER X

THE RIDE FOB HELP

"There's Pink-eye!" exclaimed Ned Rector.

"Is it possible?" answered the Professor. "Then something has happened to Tad."

"Mebby—mebby the bear's got him," suggested Stacy Brown, his face blanching.