a greeny as that. But I don't see how I can help you very much by just
driving a bumping-mule."

"You can help me in two ways: first, by doing your duty so faithfully
that I may be able to depend on you at all times; second, while I am in
doubt as to whom I may trust, it will be of great assistance to me to
know that there is at least one person constantly in the mine who will
be true to the interests of his employers, and on the alert to detect
any attempt to injure them."

"I hope you don't mean that I am to be a spy in the mine, sir?"

"No, my boy, I do not. I want you to attend strictly to your duties as
driver of a bumping-mule. At the same time I want you to consider that
your eyes and ears are acting in the place of my eyes and ears. If at
any time they see or hear anything which according to your best judgment
I ought to know, I hope you will be man enough to tell me of it."

"Well, sir," answered Derrick, "I am glad of a chance to go into the
mine and to earn five dollars a week. If you will let me do whatever I
think is right about telling you things without making any promises, I
will keep my eyes and ears wide open."

"That is all that I want you to do, my boy."

"All right, sir, then I'll do my best; and I hope I sha'n't have
anything to tell you except about the bumping-mule."

"So do I hope so with all my heart, Derrick," said the mine boss,
gravely; "for I am inclined to think that if you have anything else to
tell me it will be something very serious and unpleasant. Now you may
take this order for a pair of rubber boots and a miner's cap and lamp
over to the store and get the things. Be on hand to go down with the
first gang of the morning shift. You will find me in the mine, and I
will see that you are properly set to work. Good-night."

"Good-night," answered Derrick, as, with the store order in his hand,
and his mind full of conflicting emotions, he left the house.

Several miners of the day shift were in the store when Derrick went to
present his order. By questioning him as to what he wanted with mine
clothes, they soon learned that he was to begin life underground the
next day as driver of a bumping-mule.

"De young bantam'll find it a tougher job than riding empty cars down de
slope," sneered one big ugly-looking fellow, whose name was Monk Tooley,
and who was Bill Tooley's father.

"I reckon you've laid in a big supply of cuss-words as a stock in trade!
Eh, lad?" asked another.

"