er circumstances,
some more or less trivial, were sufficient to raise the question as to
whether, even had he taken no actual part in the terrible crime, he, in
legal phraseology was not "possessed of a guilty knowledge." Hence it
was the police decided to place the iceman under surveillance.
Thereafter his house, as well as his every movement, when out of doors,
was watched both night and day, and any attempt to leave the city would
have resulted in his immediate arrest.

CHAPTER VIII.

THE WHITE HORSE AND BUGGY--DETECTIVE COUGHLIN HIRES IT FOR A "FRIEND"--
THE TROUBLE IN THE STABLE--DINAN GOES TO SCHAACK--THE CAPTAIN'S
PECULIAR MOVEMENTS--SCANLAN IDENTIFIES THE HORSE--THE DETECTIVE AND
O'SULLIVAN ARE JAILED--THE GRAND JURY INDICTS THEM WITH WOODRUFF--FULL
ON THE TRACK OF THE CONSPIRATORS.

"Who owned the rig in which Dr. Cronin was driven to the assassin's
den?"

"Who hired the white horse and buggy--if it was hired--that Frank
Scanlan saw standing outside of the Windsor Theatre building on that
memorable May night?"

These were the questions to which the friends of the murdered physician
now directed themselves. The body had been found; the cottage in which
the crime had been committed--with all its mute but gory testimony--had
been located. But even now the wheels of the mill of justice had scarce
begun to revolve. Dr. Cronin had left his home alive; he had reached
the cottage alive. Whose rig was it that took him to it?

The question that was uppermost in the minds of thousands of people was
soon to be answered--answered, too, in a manner that furnished a still
more startling episode to the already startling tragedy. For the man
that hired the horse and vehicle that carried the Irish Nationalist to
his doom was a trusted officer in the employ of the city of Chicago; a
man who, from the day of the disappearance, had, enjoying the full
confidence of his superiors, been apparently working with might and main
to bring about a solution of the mystery. It was Daniel Coughlin,
detective.

COUGHLIN HIRES THE RIG.

Coughlin was attached to the East Chicago Avenue Police Station, which
at that time was under the direction of Captain Michael J. Schaack, who
had gained an international reputation for his brilliant work in
connection with the celebrated Anarchist cases. The station house was
located within a few doors of the southwest corner of Clark Street and
Chicago Avenue. Little more than half