Uncle Ike wanted a test of speed and endurance right there, but Jimmie held him back. It might be that they would be obliged to return to the camp that night.

They soon left the high places and wound among foothills. Below lay a fertile valley, with handsome and well-tilled fields.

"We're making a hit with these mules!" laughed Jimmie, as they passed along, the people staring at them from gates, doors, windows and fence-tops. "If these ladies and gentlemen ever see us again they'll be sure to know us."

It is not a great distance from the place where they came to the river to the city they sought, and the ground was covered in a couple of hours. The sun was still shining when they passed through a busy street, certainly the center of observation.

When they entered the telegraph office Jack took out the message and handed it to the clerk at the desk without looking at it. The clerk studied it a moment and asked: "Day rates? This seems to be a night letter."

The boys eyed each other keenly for a moment, and then Jimmie said: "I'd have it sent right off if I were you. Ned wouldn't have said anything about its being a night letter if he had had any idea we'd get here so soon."

"All right," Jack said. "Send it now. We'll wait for a little while to see if there's an answer."

"It is in cipher," the clerk said, "and will take some time to send."

"I never looked at it," Jack cried. "I' don't even know where it is going."

"To the Secret Service chief, Washington," said the clerk. "Are you boys out here on secret service business?"