"He must be full of business."

"I suppose that is so."

When Nat went to the office on the following day he again met Harry Bray
at the entrance. They went upstairs together, and found two men standing
in the hallway, near the door of the office. As soon as they entered the
place the men followed them.

"Neither of these young chaps is the man," said one of the newcomers, in
a low voice.

"Where is Mr. Hamilton Dart?" asked the other.

"I can't say, sir," answered Harry Bray. "He may be here shortly."

"Are you a partner in this concern?"

"No, sir. I am a clerk."

"Are you a clerk, too?" asked the man, turning to Nat.

"Yes, sir. Is there anything we can do for you?"

"Don't know as there is, young man," was the short answer. "We'll wait
here for Mr. Dart."

A half-hour passed and Oliver Ripple put in an appearance.

"Where is Mr. Dart?" he asked, gazing around.

"He is not here yet," answered Nat.

"I am his new clerk. He engaged me yesterday, and told me to come to
work this morning."

At this speech the two men who had come in gazed at the sick man
curiously.

"So you were engaged yesterday?" asked one in a low tone.

"Yes."

"Excuse me, but I'd like to know if you put up any money as security?"

"I did--a hundred dollars."

"Ah!" And each of the two men looked at his companion significantly.

"Do you know Mr. Dart?" asked the sick man.

"We know of him."

"He does quite a business, doesn't he?"

"He does--in his own way," was the suggestive answer.

At that moment came a tramping on the stairs. Then the office door was
thrown open, and Hamilton Dart appeared.

"There he is!" cried one of the men. "Just as I thought!"

He started for the doorway, but Hamilton Dart was too quick for him. He
backed away, leaped for the stairs, and went down flight after flight,
four and five steps at a time. Both men gave chase, but by the time they
reached the sidewalk the swindler had disappeared.

"Hullo! what can this mean?" cried Nat, in quick alarm. "I must say I
don't like this."

"Those men are after Mr. Dart," came from Harry Bray.

"You mind the office--I'll see what is up," went on Nat, and followed
down the stairs.

"He is gone, Parsons," said one of the men.

"You are sure it was our man?"

"Yes, confound the luck. He got away like a slippery eel."

"Did Mr. Dart run away from you?" asked Nat.

"That's what he did, young man."

"What did he run for?"

"Perhaps you know a