door. The newcomer was a medium-sized man, rough-faced, and poorly clad.
On the floor was a small leather grip, which evidently had been kicked
over in the scuffle, for part of a burglar's kit was scattered about the
passage.

Mallory jerked the man's wrists together, slipped on the handcuffs, and
led him out into the hall. In a moment the detective returned.

"I left him with the boys, for the present. Case of common safe-cracking."

"Do you think so?" said Harvey, adjusting his cuffs, and moving the
strange tools with his foot. "If he wanted money, I should think he would
have tackled the vault downstairs."

Mallory stooped, and replaced the kit in the bag. Suddenly he said,--

"Raise your foot, Mr. West."

Harvey did so, and the detective arose with a dirty paper in his hand. He
looked it over, and handed it to the others. It was a rough pencil sketch
of the station building, showing the alley, the window, the Treasurer's
office, and the vault.

"What do you think of it?" asked Mallory.

Harvey turned it over. A second glance showed it to be the front of an
envelope, for part of an end flap remained. The upper left-hand corner had
been torn off, evidently to remove the return card, but so hastily that a
part of the card remained. Straightening it out, and holding it up to the
light, Harvey read:--