continental ocean."
"You--you mean--" stammered Ned.
"He means this was the first land to appear above the water when this continent was all an ocean," spoke up Tad, with quick understanding.
Stacy urged his pony further into the circle. His face was flushed and he evidently was filled with some sudden new thought.
"What is it, Master Stacy?" asked the Professor.
"You--you say this was the first land to--"
"Yes, so it has been said."
"Then--then this--then this must have been where the Ark landed," exploded the fat boy.
For a few seconds a profound silence greeted this announcement. Then the lads broke out into a shout of laughter. Even Professor Zepplin threw his head back and laughed immoderately.
"I am afraid, my young friend, that the place where the ancient craft ran aground was some distance from this rugged spot--"
"But why not?" persisted the boy.
"In the first place, this continent came to life some time after the event you speak of is supposed to have taken place."
"Oh," muttered the lad.
"And now we had better be pressing on."
"When do we reach the Red Star Mine?" asked Ned.
"You will have to ask Eagle-eye. I don't know."
The Indian, when questioned on this point, said the Red Star Mine lay three suns to the southwest of them.
The country seemed to be getting more rough as they proceeded, and it had now become necessary to move with extreme caution for fear of plunging over one of the many abrupt cliffs that now and then appeared almost under the feet of the advancing train.
But the Indian seemed to feel no concern over these. He merely changed his course, skirting the canyon until a turn in its winding course enabled him to head straight into the southwest again.
Not even in the Rockies had the boys met with such peculiar formations as now appeared on all sides of them.
"I'd hate to travel this trail in the night," growled Stacy.
"You wouldn't have to travel it far," laughed Tad. "You'd be walking on air before you knew it."
Stacy had pressed on ahead while the others were talking. He had observed what they had not. One of the pack mules had lagged behind, and with head lowered almost to the ground appeared to have gone sound asleep. The Shawnee, engaged with his own thoughts, apparently was unaware that he had left a mule behind.
The fat boy, with great glee, was urging his pony quietly along, approaching the pack animal with as much caution as possible. It was Stacy's intention to give the beast the fright of its life, in which ambition he succeeded beyond his fondest anticipations.
Getting near enough for his purpose, Stacy slipped from his pony, hunted about until he found a stick long enough for his purpose, and with this crept up on the sleeping mule.
With a shrill shriek the lad brought the stick down on the long-eared animal's rump with a whack that, while it could not have hurt, did all that he had hoped it might.
Both the mule's hind feet shot up into the air, while the beast with a short, sharp bray of fright lunged straight ahead.
The guide uttered a shrill exclamation of warning as he saw the mule tearing through the bushes to the left of the trail. Leaving his two pack animals, Eagle-eye leaped for the fleeing one.
But he was too late.
All at once the frightened beast appeared to stand on his head, his hind feet beating a tattoo in the air; then he disappeared altogether.
The Pony Rider Boys, hearing the disturbance, had hurried up, and just in time to see the final scene in the little tragedy that their companion had caused.
"What's this? What's this?" demanded the Professor. "What's the matter?"
"Pony fall down! Pony fall down!" exclaimed the Indian, with a trace of excitement in his tone.
"He means our long-eared friend has taken a header over that rock there," Ned Rector informed them.
"I am afraid it is more serious than that," added Tad. "It looked to me as if the pack mule went over a cliff."
"Him fall down, fall down, fall down," repeated the guide.
Chunky, frightened at the result of his prank, had quickly scrambled into his own saddle and drawn back from the scene of his late exploit.
Professor Zepplin did not understand how it had happened.
"I'm to blame, sir," announced Chunky, plucking up courage and riding up beside the Professor. "I hit him with a stick and he ran away."
In spite of the disaster that had come upon them, the boys could not but laugh at the boy's rueful countenance. Nor did the Professor find it in his heart to be harsh.
"You deserve to be punished, sir, but somehow when I look at you my anger vanishes instantly. The next question is, how are we going to get the beast up here? What do you say, guide?"
"Him dead."
"What's that?"
"Pack pony,
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