pegs were driven deeply into the ground and in a trice the animals
were made fast to them, though they snorted, and tried to pull away
as they heard the neighing of the stampeding animals and saw them
coming on with an irresistible rush.

"Hurry!" begged San Pedro, and hurry Tom, Ned and the others did.
Animal after animal was made fast--that is all but one and that bore
on its back two rather large but light boxes--the contents of the
case which Tom had rescued from the fire in the hold.

"What are you going to do with mule?" asked Ned, as he saw Tom begin
to lead the animal away, the others having been pegged out.

"I'm going to take him over to the rocks with me. I'm not going to
take any chances on this mule getting away with those things in the
boxes. Give me a hand here, and then we'll see what the electric
rifles will do against those horses."

But the one mule which Tom had elected to take with him seemed to
resent being separated from his companions. Bracing his feet well
apart, the animal stubbornly refused to move.

"Come on!" yelled Tom, pulling on the leading rope.

"Bless my porous plaster!" cried Mr. Damon. "You'd better hurry,
Tom! Those wild horses are almost on us!"

"I'm trying to hurry!" replied the young inventor, "but this mule
won't come. Ned, get behind and shove, will you?"