things connected with ranch life. 
He and Frank had never become friends. There was something about 
the fellow that the saddle boy could not tolerate. More than once they 
had almost come to blows; and, only for the peace-loving nature of
Frank, this must have occurred long ago. 
The two chums had taken the long gallop to the town on the railroad on 
this particular day to do a little important business for Mr. Haywood, 
who was associated with Bob's uncle in certain large mining enterprises. 
And it was while entering the town that they met Peg, who, with his 
customary assurance, had halted them with the question that begins this 
chapter. 
When Frank give him this little cut, the face of Peg Grant showed signs 
of anger. He knew very well that he was making wretched progress 
along the line of becoming an accomplished rider and cowboy. And the 
easy manner in which the other boys sat their saddles irritated him 
greatly. 
"What does it matter to you, Frank Haywood, when I left the greenhorn 
class and moved up a pace? All the boys of the X-bar-X outfit say I'm 
full-fledged now, and able to hold my own with nearly any fellow. It'll 
be some time, I reckon, before your new friend can say the same. But I 
will own that he's got a horse that takes my eye, for a fact." 
"That's where you show good judgment, Peg," said Frank, laughing. 
"He brought that black horse with him from Kentucky. And he can ride 
some, you'd better believe me. When he gets on to the ways we have 
out here, Bob will hold his own against heaps of boys that were born 
and brought up on the plains." 
"Say, I don't suppose, now, you'd care to sell that animal, Archer?" 
asked Peg, as he eyed the handsome mount of the Kentucky boy 
enviously. "Because I fancy I'd like to own him more than I ever did 
that frisky buckskin Frank rides. If you'd put a fairly decent price on 
him now--" 
"I raised Domino from a colt, I broke him to the saddle, and we have 
been together five years now. Money couldn't buy him from me," 
replied the tall boy, curtly. 
It was not Bob Archer's habit to speak in this strain to anyone; but there
seemed to be a something connected with Peg Grant that irritated him. 
The manner of the other was so overbearing as to appear almost rude. 
He had had his own way a long time now; and thus far no one 
connected with the big ranch owned by his father had arisen to take him 
down. 
"Oh! well, there are plenty of horses just as good, I guess," Peg went on; 
"and some people don't appreciate the value of money, anyway. But see 
here, Frank, you let your eyebrows travel up when I mentioned the fact 
that I'd graduated from the tenderfoot class. I could see that you 
doubted my words. Now, I'm going to tell you something that will 
surprise you a heap. Are you ready for a shock?" 
"Oh; I can brace myself for nearly anything, Peg," replied Frank, easily; 
"so suppose you tell us your great news. Have you entered for the 
endurance race at the annual cowboy meet next month; or do you 
expect to take the medal for riding bucking broncos?" 
"Any ordinary range rider might do that, even if he lost out," Peg went 
on; "but my game is along different lines; see? I'm on my way right 
now to run down the mystery of Thunder Mountain! I understand that 
for years it's puzzled the whole country to know what makes that 
roaring sound every now and then. Many cowboys couldn't be hired to 
spend a single night on that mountain. As for the Indians, they claim it 
is the voice of Great Manitou; and steer clear of Thunder Mountain, 
every time. Get that, Frank?" 
"Well, Peg, you have given me a jolt, for a fact," answered the saddle 
boy, as his face expressed his surprise. "I allow that you show a lot of 
nerve in laying out such a big plan; and if you only find out what 
makes that trembling, roaring sound, you'll get the blessing of many a 
range rider who believes all the stories told about Thunder Mountain." 
Peg stiffened up in his saddle, as though he realized that he was 
engineering a tremendously important thing; and had a right to be 
looked up to as a hero, even before the accomplishment of the deed. 
"Well, that's always the way with you fellows out here, I find," he
remarked, loftily; "you leave all the big things to be done by fellows 
with real backbone. But then, I don't mind; in fact I'm obliged to you    
    
		
	
	
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